JP2007267469A - Portable tool for emergency/disaster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable tool for emergency and disaster that can supply electric power so stably as to make various functions performed, by making full use of the characteristics of an electric double-layer capacitor and that is easy to carry and cost effective. <P>SOLUTION: This portable tool is provided with a power supply B having at least a solar cell 1, a manual generator 2, and an external power source connection 3; a charger C having at least the electric double-layer capacitor 11 which is charged by electric power supplied from the power supply B; and a load E having at least a radio receiver 21, an emergency alarm 22, and an LED light 23. The electric double-layer capacitor 11 of the charger C is charged by the solar cell 1 and/or the manual generator 2 of the power supply B. The load E is driven and used by the charged electric double-layer capacitor or by the charged electric double-layer capacitor and the solar cell 1 and/or the manual generator 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an emergency / disaster portable device that can be carried for emergency / disaster countermeasures in the event of a disaster to secure a power source and collect information, notify, and contact.

Examples of this type of portable device include a micro battery pack with a built-in manual generator (see, for example, Patent Document 1), a charger with a loudspeaker for a mobile phone with built-in radio (for example, see Patent Document 2), and a portable radio system (for example, Patent Document 3) is known, and those that exhibit various functions by using a plurality of power supplies are already on the market. A manual power supply device itself has also been proposed (see, for example, Patent Document 4).
The ultra-small battery pack disclosed in Patent Document 1 supplies electricity generated by a manual generator to a battery and stores it, so that it can be used in a portable telephone, a portable personal computer, a portable phone even when there is no power supply or under power outage. Electricity is supplied to a radio for use.
The charger disclosed in Patent Document 2 has a power source to which power supplied from an outlet plug is supplied, feeds power to a radio amplifier, works a speaker, and allows a mobile phone radio to be operated through an audio plug. On the other hand, the charging circuit is also powered so that the mobile phone can be fed through the charging DC jack.
The portable radio system disclosed in Patent Document 3 includes a wristwatch provided with a power supply outlet that can take out power from a solar battery that can store electricity and that can be connected to a power plug from the outside. A storage unit for storing a power plug to be connected is provided, and a storage unit for storing an assembly-type earphone connected through an audio output circuit that is integrated into an IC by power supplied from the power plug. It consists of a card-like portable radio.
JP 2001-189152 A JP 10-313257 A JP-A-7-221658 JP-A-6-217494 Japanese Patent No. 2964859

Since the manual generators described in Patent Documents 1 and 4 are operated by a person to generate power and use it as a power source, no external power source is required. However, in the method of pulling the yarn described in Patent Document 1, the power generation operation is repeatedly returned after being pulled. Further, in the hand turning method described in Patent Document 4, it is difficult to stabilize the rotation state even if continuous operation is possible. Although the solar cell described in Patent Document 3 does not require human operation, it cannot receive light stably due to changes in clear weather, rain, cloudy weather, nighttime, and the like.
Therefore, in any case, there is a difficulty in supplying stable power for a long time, which is not sufficient for emergency and disaster use.
Therefore, in many cases, as described in Patent Documents 1 to 3, the generated power or the power supplied from a commercial power source or the like is supplied to the rechargeable battery and stored, so that stable power supply can be performed when necessary. To be done.

  However, storing power with a rechargeable battery is particularly problematic for emergency and disaster portable devices. In general, a rechargeable battery has a life of 500 to 1000 times. Briefly, for example, assume that the radio can be heard for 12 hours when the rechargeable battery is fully charged. Then, if you listen to the radio for 1 hour every day, it will be fully discharged after 12 days. Therefore, full charge is performed again. Such repeated use is ideal, and a theoretical lifetime neglecting aging can be used for 12 days × 500 times = 6000 days ÷ 365 days = about 16 years. On the other hand, in the case of charging with a hand-held generator, even if it is charged with power generation exceeding the desired voltage desired for the rechargeable battery, to listen to the radio for 30 minutes with a one-minute charge that is not full charge, 1 to listen a little more If the minute charge is performed again, the number of times of charging will be twice as early as possible. Thus, if it charges twice a day, it will be 60 times a month, and a lifetime will be exhausted in about 8 months.

In addition, charging of the rechargeable battery requires that the voltage of the charging power source is higher than the voltage of the rechargeable battery. For example, if the voltage of two rechargeable batteries is 2.5V in series, and the voltage of the rechargeable battery at the time of charging is 2.8V, the voltage required for the charging power supply is 2.9V or higher. . Therefore, it is not suitable for a manual power generator with unstable voltage or a charging power source using solar cells. Moreover, the charging time requires time obtained by dividing the charging capacity of the battery to be charged by the charging current. In other words, if a rechargeable battery of 2.5 mA and 1200 mA / h is charged with a charging power source capable of flowing 50 mA at 3.5 V or more, a long time of 1200 mA / h ÷ 50 mA = 24 h is required until the charging is completed. This is a condition that cannot be expected for applications that are expected to be used in small urgent or disaster situations.
In addition, this is an ideal case in which charging is started from the specified voltage of charging, that is, complete discharging, and full charging is performed. The specified discharge voltage is specified by each battery manufacturer. If it is charged without being completely discharged, the charging time is surely shortened, but this means that only about 1/2 of the chargeable power can be charged, and it cannot be fully charged. For example, if charging is started when the remaining power amount is 1/2 (600 mA / h), it is possible to charge 300 mA / h, which is 1/2 of the consumed power amount, and only about 900 mA / h can be charged in total. . If this is repeated, the rechargeable battery will recognize that 900 mA / h is fully charged. This is a decrease in life due to the memory effect. In reality, it is difficult to secure a charge amount of 100%, and the amount of electric power (voltage × current) that can be used decreases. Lithium batteries are generally considered not to have a memory effect, but if they are recharged, their lifetimes are clearly lower than if they are not. Therefore, the emergency / disaster portable device is not suitable for charging with a manual generator or a solar battery and using it in small steps.

On the other hand, since the rechargeable battery uses heavy metal, there are restrictions and inconveniences that must be considered for recycling.
The rechargeable battery must be stored in a charged state. If stored in a discharged state, it is destroyed and cannot be charged. There is a problem that spontaneous discharge is inevitable even if it is charged, and things that are easily left unattended for a long time, such as emergency and disaster portable devices, cannot be used at a critical time.
If the rechargeable battery is handled with great care, a large current can be taken out and it can be used for a long time. However, there are concerns and anxieties as described above for use in emergency and disaster portable devices, which is an important issue for safety.

Patent Document 5 discloses a solar cell device in which a solar cell and an electric double layer capacitor are combined.
In general, in storage technology, as a power source for unmanned lighthouses and street lamps, with the goal of no self-discharge in the storage battery, easy maintenance, long life, low price, large capacity per volume, and high charge / discharge efficiency, etc. Low-cost and economical lead-acid batteries and nickel-cadmium batteries that are strong against overcharging and discharging and have a long cycle life are mainly used.
On the other hand, in Patent Document 5, it is necessary to set the solar cell capacity and the storage battery capacity large so as to have a sufficient margin due to the instability of the output of the solar cell, and installation with clear solar radiation is essential. The battery life is about 200-500 times and needs to be replaced in 2 to 3 years. Lead-acid batteries have secondary pollution caused by heavy metals. Furthermore, it is pointed out that the operating range of the secondary battery is as narrow as 0 to 50 ° C., which hinders its use in cold regions.
In order to solve these problems, the solar cell device described in Patent Document 5 has a capacity to generate electric power consumed by a load per day with an assumed amount of solar radiation in rainy or cloudy weather, and is in a shaded place. A solar cell that can be installed at the same time, an electric double layer capacitor that stores the electric power generated by the solar cell, and has a storage capacity sufficient to supply the load power for the day that the load consumes in one day, and the ambient illuminance is When the set value is exceeded, the electric double layer capacitor is charged with electric power from the solar cell, and when the ambient illuminance is below the set value, the electric power accumulated in the electric double layer capacitor is supplied to the load and charged / discharged daily. Is controlled based on detecting the output of the solar cell.
However, although the solar cell device described in Patent Document 5 takes advantage of the characteristics of the electric double layer capacitor exceeding the secondary battery, the configuration and function for guaranteeing the load power consumed per day are used very rarely. However, even if it is used, emergency / disaster portable devices that are expected to be used repeatedly for a short time are not suitable in terms of structure, cost, and power supply function.

  Therefore, the present invention takes advantage of the characteristics of the electric double layer capacitor, is rarely used, and when used, even when repeatedly used for a short time, it can stably supply power and exhibit various functions, and is easy to carry. The issue is to provide inexpensive emergency and disaster portable equipment.

To achieve the above object, the emergency / disaster portable device of the present invention comprises at least a solar cell, a manual generator, a power source unit having at least an external power source connection unit, and an electric double layer capacitor charged by power feeding from the power source unit. An electric double layer capacitor of the charging unit by one or both of a solar cell and a manual generator of the power source unit, and a charging unit having a load unit having at least a radio receiving unit, an emergency notification unit, and an LED light unit And using the charged electric double layer capacitor or the charged electric double layer capacitor, the solar cell and the manual generator, or both of them to drive and use the load section. This is the first feature.
Further, in the emergency / disaster portable device of the present invention, in addition to the first feature, the charging unit is charged by an external power source connected to the external power source connection unit in addition to the electric double layer capacitor. The second feature is that the load unit can be driven by either or both of the charged secondary battery and the external power source.
Further, in addition to the first or second feature, the emergency / disaster portable device of the present invention has a third feature that the LED light unit is composed of an ultra-bright LED and is driven by a boosted voltage by an inverter. It is said.
In addition to the third feature, the emergency / disaster portable device of the present invention has a fourth feature that the LED light unit has a plurality of ultra-bright LEDs and has means for switching the number of drives. It is said.
Further, in the emergency / disaster portable device of the present invention, in addition to any of the first to fourth features, the external power supply connection unit is a connection unit with an external power supply including at least a DC adapter and a personal computer. Is the fifth feature.
Moreover, the emergency / disaster portable device of the present invention has an external device connecting portion in which, in addition to any of the first to fifth features, the load portion can further receive power from the power supply portion in a switchable manner. It has the 6th characteristic to have.
Moreover, the emergency / disaster portable device of the present invention, in addition to any one of the first to sixth features, simultaneously drives any two or more of the radio receiving unit, the LED light unit, and the emergency notification unit. The seventh feature is that the switch is configured so that it cannot be performed.

According to the emergency / disaster portable device according to claim 1, the power source unit is a solar cell, a manual generator, one or more external power sources connected to the external power source connection unit, a weather condition, Power can be selected and supplied flexibly according to conditions and circumstances, from advantages and possibilities, such as the presence of manpower, the presence or absence of an external power supply, and the necessary power and the degree of urgency.
On the other hand, since the electric double layer capacitor of the charging unit is charged by one or both of the solar cell and the manual generator of the power source unit, it is sufficient for small power by the solar cell and the manual generator. In addition to being able to charge (accumulate electricity) quickly and reliably, it is also possible to charge (accumulate electricity) in response to unstable power.
The load unit is driven by a charged electric double layer capacitor, or by a charged electric double layer capacitor and a solar cell or a manual generator, so that a stable load can be driven. In particular, by using a charged electric double layer capacitor in combination with a solar cell or a manual generator and supplying power to the load section, it becomes possible to supply power continuously and stably without consuming power in a short time. .
Of course, by using an electric double layer capacitor, the charge and discharge characteristics of the electric double layer capacitor can be used without suddenly reducing the service life due to unstable power supply on the power source side, repeated charging, repeated incomplete charging, etc. In response to emergencies and disasters that occur, it is possible to efficiently charge the power supply to its full capacity and to enable stable driving of the load.
In addition, the electric double layer capacitor can avoid environmental problems due to heavy metals such as secondary batteries.
As described above, the emergency / disaster portable device of the present invention mainly uses the solar battery and the electric double layer capacitor for charging and the reception of radio broadcasts during an emergency / disaster. Since solar cell power generation always compensates for the amount of electric power of the electric double layer capacitor during sunlight, it can be used for a longer time than the capacity of the electric double layer capacitor. Therefore, unlike existing products of the same type, it is possible to realize new functions such as substantially no need to replenish electric power with a manual generator during sunshine.

  According to the emergency / disaster portable device described in claim 2, in addition to the effect of the configuration described in claim 1, the load portion is driven by using the electric double layer capacitor, in addition to the two. The secondary battery can be used for driving, and the charge / discharge characteristics of the electric double layer capacitor enable efficient charging even for unstable power supply with small electromotive force on the power supply side, and repeated charging. In addition, it is possible to efficiently charge the power supply to the full capacity without causing a decrease in life due to repeated incomplete charging, enabling stable driving for more loads and high power consumption. By using a secondary battery according to other conditions, such as power supply to the load, depending on the amount of required power, the presence of external power, and other conditions, high voltage output can be easily obtained, and stable driving of loads with high power consumption Ten It is possible to contribute in response to.

  According to the emergency / disaster portable device according to claim 3, in addition to the effect of the configuration according to claim 1 or 2, the LED light portion is an ultra-high brightness LED, so that the low-voltage power supply portion Even when power is supplied from the charging unit, the high-intensity illumination can be stably achieved by supplying power via the booster of the inverter, and the function of notifying the transmission source at night or in the dark can be enhanced.

  Further, according to the emergency / disaster portable device described in claim 4, in addition to the effect of the configuration described in claim 3, the plurality of ultra-high brightness LEDs included in the LED light unit are replaced with the type of power source of the power source unit, The number of lightings can be selected according to the charging type of the charging unit, the remaining charge amount, etc., and the necessary high-intensity illumination can be achieved without waste.

  According to the emergency / disaster portable device according to claim 5, in addition to the effect of the configuration according to any one of claims 1 to 4, the external power source connection portion includes at least a DC adapter and a personal computer. By connecting to the power supply, the DC power supply, the power of the personal computer, other DC external power supplies and other power supplies can be applied as necessary or according to the situation of the situation to charge the secondary battery. Alternatively, the load can be driven.

  According to the emergency / disaster portable device according to claim 6, in addition to the effect of the configuration according to any one of claims 1 to 5, the power supply from the power supply unit can be received in a switchable manner as the load unit. By including the external device connection section as described above, the mobile phone and other external devices can be charged using the external device connection section.

  According to the emergency / disaster portable device according to claim 7, in addition to the effect of the configuration according to any one of claims 1 to 6, the radio reception unit, the LED light unit, and the emergency notification unit Since the switch is configured so that any two or more cannot be driven at the same time, only one of the radio receiver, the LED light unit, and the emergency notification unit can be driven, resulting in rapid power consumption. It is possible to prevent the situation from progressing, and to reliably avoid a situation where the power supply to each load unit falls together.

  With reference to the following drawings, an emergency / disaster portable device according to an embodiment of the present invention will be described for understanding of the present invention. However, the following description is a specific example of the present invention and does not limit the contents described in the claims.

  As shown in the embodiment of FIG. 1, the emergency / disaster portable device A of the present invention includes a solar cell 1, a manual generator 2 by hand-cranking, etc., and an external power supply connection portion 3 that can be connected to an external power supply 4. A power supply unit B having a power supply unit, a charging unit C having an electric double layer capacitor 11 charged by power supply from the power supply unit B, a load unit having a radio reception unit 21, an emergency notification unit 22, and an LED light unit 23 E. The electric double layer capacitor 11 of the charging unit C can be charged using the solar cell 1 and the manual generator 2. Then, any one of the radio reception unit 21, the emergency notification unit 22, and the LED light unit 23 of the load unit E with the charged electric double layer capacitor 11 or with the solar cell 1 or the manual generator 2 added thereto. Is used for use.

The external power supply connection section 3 of the power supply section B is connected to the switch SW1 by connecting the external power supply 4 thereto, and the external power supply 4 is connected to the secondary battery 12 and the switch SW3 side described later. Configured as follows.
Therefore, the electric power from the power supply unit B is supplied to the electric double layer capacitor 11 of the charging unit C by either one or both of the solar battery 1 and the manual generator 2, and the secondary battery 12 is supplied by the external power supply 4. Charged. Further, in a state where the external power supply 4 is not connected to the external power supply connection portion 3, the switch SW <b> 1 can be switched so that the secondary battery 12 can be charged also by the manual generator 2.

In particular, by charging the electric power from the solar cell 1 using the electric double layer capacitor 11, the charging / discharging characteristic of the electric double layer capacitor 11 enables efficient and good charging characteristics even for small power supply by the solar cell 1. Can be demonstrated. In addition, even when unstable power supply or charging by the solar cell 1 or manual generator 2 is repeated, charging is performed by efficiently charging the power supply to the full capacity without causing a decrease in service life. Can be driven stably.
As the electric double layer capacitor 11, for example, a capacitor of 10F2.3V can be used. Two or more electric double layer capacitors 11 may be arranged in parallel.
Moreover, if only the electric double layer capacitor 11 is used for the charging part C, the problem to the environment by the heavy metal of the secondary battery 12 can be avoided.

The secondary battery 12 is provided in the charging part C so that it can be used together with the electric double layer capacitor 11. As described above, the secondary battery 12 can be efficiently charged by charging using the external power source 4.
In addition, as the secondary battery 12, a 2.4V nickel cadmium rechargeable battery can be used.

The load unit E can be provided with an external device connection unit 24 in addition to the radio reception unit 21, the emergency notification unit 22, and the LED light unit 23. Therefore, the power from the power supply unit B can be supplied to the external device connected to the external device connection unit 24 in addition to any of the radio reception unit 21, the emergency notification unit 22, and the LED light unit 23 of the load unit E. It becomes. More specifically, the external device connection unit 24 is supplied with electric power from the manual generator 2 through the switching connection of the switch SW1.
In this way, the electric power from the power supply unit B is fed to the external device connected to the electric double layer capacitor 11, the secondary battery 12, the load unit E, and the external device connection unit 24. The electric power from the power supply unit B can mainly charge the electric double layer capacitor 11 by using the surplus or all of the power supply to the load unit E.
Charging using the electric double layer capacitor 11 causes a decrease in life due to unstable power supply on the power source side, repeated charging, repeated incomplete charging, etc., due to the charge / discharge characteristics of the electric double layer capacitor 11. Rather, it efficiently charges the power supply to the full capacity, enabling stable driving for more loads. When performing using only the secondary battery 12 as in the prior art, the secondary battery cannot be efficiently charged by supplying a small amount of power from the solar battery 1, and there is a problem of life due to the number of times of charging and the memory effect. Occurs.

  In the present invention, the electric double layer capacitor 11 and the secondary battery 12 are appropriately selected and used, so that the electric double layer capacitor 11 causes unstable power feeding on the power source side, repeated charging, repeated repeated incomplete charging, and the like. Without being charged, it is possible to combine the charging of the power supply efficiently to the full capacity and the high-voltage output by the secondary battery 12 to contribute to the stable driving of the load with high power consumption. Power can be supplied to E.

Here, in the emergency / disaster portable device A of the present embodiment, the LED light unit 23 is composed of ultra-high brightness LEDs 23a and 23b, and is driven by the boosted voltage by the inverter 25.
Since the LED light unit 23 is an ultra-bright LED 23a, 23b, even with a low-voltage power supply from the power supply unit B or the charging unit C, the inverter 25 boosts the voltage to stably produce a high-intensity illumination. It is possible to enhance the transmission source notification function in the dark. Moreover, the LED light unit 23 has a plurality of ultra-high brightness LEDs 23a and 23b, and has a switch SW4 as a switch configuration for switching the number of drives. Specifically, the switch SW4 can select whether to drive one ultra-bright LED 23a or to drive four more super-bright LEDs 23b in combination with power supplied from the power supply unit B or the charging unit C. I have to.
As a result, the number of lights of the plurality of ultra-high brightness LEDs 23a, 23b of the LED light unit 23 is selected according to the type of power source of the power source unit B, the charging type of the charging unit C, the remaining charge amount, etc. The necessary high-intensity illumination can be achieved without waste.

The external power source connection unit 3 can be a connection unit with an external power source 4 such as a primary battery, a DC adapter, or a mobile phone power source. The greater the number of types that can be connected, the greater the power usage environment in an emergency situation. Can be increased.
Further, since the external device connection unit 24 is the UBS terminal 24a, it is possible to charge a mobile phone or the like, which is an external device, using the UBS terminal 24a. The USB terminal 24a is provided with a constant voltage circuit 35 so that stable power can be supplied.

Switch the power supply from the manual generator 2 of the power source B to the secondary battery 12 side (A), the USB terminal 24a side (B), and the electric double layer capacitor 11 side (C) by the switch SW1. Can do.
In addition, the switch SW2 supplies power from the power supply unit B and the charging unit C to the load unit E to the emergency notification unit 22 side (A), the radio reception unit 21 side (B), and the LED light unit 23 side (C). It can be switched to any one of.
The switch SW3 can be used to switch between power supply from the electric double layer capacitor 11 side (A) and power supply from the secondary battery 12 side (B).
In the case of the switch SW2, the power supply to the load unit E is limited to any one of the radio reception unit 21, the emergency notification unit 22, and the LED light unit 23 so that two or more cannot be driven simultaneously. By configuring in this way, it is possible to prevent a situation in which power supply is insufficient by prohibiting mass consumption and consumption of stored power by simultaneously using the radio reception unit 21, the emergency notification unit 22, and the LED light unit 23. it can.
In addition, when the switch SW4 is turned on and the plurality of ultra-bright LEDs 23a and 23b are used, the switch SW3 is configured to be connected to the secondary battery 12 side (b) so as to output a high voltage. To ensure.

The radio receiver 21 may be an FM / AM receiver using an IC or the like. In addition, a monotone speaker 32 can be connected to the output unit via the 3P jack 31.
The emergency notification unit 22 can make an emergency notification by sounding a siren by an IC or the like 0, a sound by a blink light 33 made of an LED or the like, and a flashing light.

  The external power supply connection section 3 of the power supply section B has a 3.5φ, 3P jack 34, and can be supplied with power by connecting an external power supply 4 such as a DC5V DC adapter. As a result, the secondary battery 12 can be charged as easily as possible, and the drive of the load portion E can be stabilized.

  Although not shown, it is preferable to add a power generation check function, a charge check function of the electric double layer capacitor 11, a charge check function of the secondary battery 12, and a remaining capacity check function of a battery as the external power source 4.

  Since the present invention is carried in an emergency or disaster, a small current and unstable current from the solar cell 1 etc. are obtained by a charging function peculiar to an electric double layer capacitor while ensuring a power supply situation with a high degree of freedom of selection. In addition, it enables reliable and efficient charging, and also enables stable driving of the load section E by selecting the power supply section B and charging section C, so that it can flexibly respond to emergencies and disasters. is there.

It is a circuit diagram which shows the portable device for emergency and disaster which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell 2 Manual generator 3 External power supply connection part 4 External power supply 11 Electric double layer capacitor 12 Secondary battery 21 Radio reception part 22 Emergency notification part 23 LED light part 23a Super bright LED
23b Super bright LED
24 External device connection unit 24a USB terminal 25 Inverter 31 3P jack 32 Monotone speaker 33 Blink light 34 Jack 35 Constant voltage circuit A Emergency / disaster portable device B Power supply unit C Charging unit E Load unit SW1-4 switch

Claims (7)

  A power supply unit having at least a solar cell, a manual generator, an external power supply connection unit, a charging unit having at least an electric double layer capacitor charged by power supply from the power supply unit, a radio reception unit, an emergency notification unit, and an LED light unit A load unit having at least, and the electric double layer capacitor of the charging unit is charged by one or both of the solar cell and the manual generator of the power supply unit, and the charged electric double layer capacitor or the charging unit An emergency / disaster portable device characterized in that the load portion is driven and used by any one or both of the electric double layer capacitor, the solar cell, and the manual generator.   The charging unit has a secondary battery that is charged by an external power source connected to the external power source connection unit in addition to the electric double layer capacitor, and is charged by either or both of the charged secondary battery and the external power source. The emergency / disaster portable device according to claim 1, wherein the load portion can be driven.   The emergency / disaster portable device according to claim 1, wherein the LED light unit is made of an ultra-high brightness LED and is driven by a boosted voltage by an inverter.   4. The emergency / disaster portable device according to claim 3, wherein the LED light unit has a plurality of ultra-bright LEDs and is configured to be switchable so that the number of drives can be switched.   The emergency / disaster portable device according to any one of claims 1 to 4, wherein the external power supply connection portion is a connection portion with an external power supply including at least a DC adapter and a personal computer.   The emergency / disaster portable device according to any one of claims 1 to 5, wherein the load unit further includes an external device connection unit that can switchably receive power from the power supply unit.   The radio reception unit, the LED light unit, and the emergency notification unit are configured so as not to be able to drive any two or more of them at the same time. Emergency and disaster portable equipment.

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