EP0066952B1 - Sensor system responsive to a fire or explosion - Google Patents
Sensor system responsive to a fire or explosion Download PDFInfo
- Publication number
- EP0066952B1 EP0066952B1 EP82302245A EP82302245A EP0066952B1 EP 0066952 B1 EP0066952 B1 EP 0066952B1 EP 82302245 A EP82302245 A EP 82302245A EP 82302245 A EP82302245 A EP 82302245A EP 0066952 B1 EP0066952 B1 EP 0066952B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control signal
- fire
- sensor system
- spectral band
- detector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004880 explosion Methods 0.000 title claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 16
- 230000009977 dual effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 230000001934 delay Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
Definitions
- the present invention provides a sensor system of the type disclosed in US-A-4 220 857 comprising a first control signal means responsive to a first radiant energy detector, for generating a first control signal when the first detector detects electromagnetic energy within a first spectral band having an amplitude greater than a first predetermined level; a second control signal means responsive to a second radiant energy detector, for generating a second control signal when the second detector detects electromagnetic energy within a second spectral band having an amplitude greater than a second predetermined level; and a third control signal means responsive to the first and second radiant energy detectors, for generating a third control signal whenever the ratio of the energy detected by the first detector to the amplitude of the energy detected by the second detector exceeds a third predetermined level.
- the length of the delay period may be determined in various ways by different types of delay circuits incorporated in the third channel.
- the type of delay circuit utilized may depend on the type of fire or explosion that might be expected to occur in the monitored area.
- a simple type of delay circuit is one that merely interrupts the generation of the fifth control signal for a predetermined period of time after the difference between the first and second control signals exceeds the third predetermined level.
- a three channel sensor system 10 has a photon detector 15 that is responsive to radiant energy within a spectral band of relatively short wavelength (0.7 to 1.2 pm, for example), and a thermal detector 20 that is responsive to a spectral band of relatively long wavelength (7 to 30 pm, for example).
- the analog output of each detector 15 and 20 is amplified by amplifiers 25 and 30 respectively.
- the outputs of amplifiers 25 and 30, which are hereinafter called nodes a and b respectively, are fed to amplifiers 35 and 40 respectively.
- the output of amplifier 35 is fed to a threshold device 45 having a predetermined threshold level Vn.
- the output of amplifier 40 is fed to a threshold device 50 having a predetermined threshold level V T2 .
Description
- This invention relates to the field of devices that sense the presence of an undesirable fire or explosion within a protected area or compartment, and thereafter cause a fire suppressant to be released to extinguish the fire.
- More particularly, this invention relates to a device that will distinguish a fire from the flash produced, for example, by a projectile penetrating a wall of the protected area, and release the suppressant only when it senses a fire.
- There are many situations where the protection of human life requires that an area or a compartment be protected from fires. For instance, the crew and passenger compartments and the engines of aircraft are areas where a fire can quickly cause disaster. However, the fire suppressant carried on aircraft adds weight that reduces performance, and generally only the amount of suppressant necessary to extinguish expected fires is carried. The timing of the release of the suppressant is critical. If released too soon, it may be exhausted before it is really needed; if released too late, it may not be adequate to suppress the fire.
- Military vehicles, such as aircraft, tanks and personnel carriers, may be vulnerable to fires caused by the entry of projectiles or flak. When a projectile or a piece of flak pierces a wall of a compartment, it causes a flash of radiant energy in the ultraviolet, the visible, and the infrared spectral regions. Prior art fire sensors, depending on their individual capabilities, would do one of two things-the fire sensor might interpret the flash as a fire and release the suppressant before the fire actually developed; or even if the fire sensor determined that the flash was not a fire, it might interpret a quickly developing fire as the continued presence of the flash, and thereby fail to release the suppressant. (In technical literature, the words "detector" and "sensor" are sometimes used synonymously. Here, "detector" refers to a radiation sensitive element that converts electromagnetic radiation to electrical signals. The word "sensor" refers to a system using at least one "detector", and which includes some other electronic apparatus to amplify or process the "detector" signals).
- The fire sensor system disclosed in U.S. Patent No. 4,206,454 to Schapira, et al is capable of sensing fires, but would also react to suppress the flash caused by a projectile penetration. The projectile flash would radiate a quick-rising short-wavelength component and a slow-rising long-wavelength component which would activate the suppressant as soon as the long-wavelength component passed the threshold level. But, such operation might be unnecessary if no fire resulted from the projectile penetration, or might occur too soon if the fire ignition was delayed, as when leaking fuel is subsequently ignited.
- The fire sensor system disclosed in U.S. Patent No. 4,220,857 to Bright is likewise disadvantageous since it would interpret the projectile flash to be a fire. On impact, the projectile often releases a small amount of incendiary or produces an explosion, both of which generate a large amount of carbon dioxide as the product of combustion, even though the combustion may be very short-lived and produces no substained hydrocarbon fire. Since Bright's system responds to a situation where the non-Planckian emission of the carbon dioxide molecule at 4.4 micrometers (for example) exceeds the Planckian emission at adjacent wavelengths, a fire output signal would result. Thus, suppressant would be released to suppress a flash and explosion that would have dissipated shortly by itself.
- The fire sensor system disclosed in U.S. Patent No. 4,101,767 to Lennington, et al will also have difficulty distinguishing a flash from a fire. The Lennington system is basically a single channel fire sensor (using detector 30) with a discrimination circuit (
detectors 10 and 20) to prevent outputs as long as the colour temperature is greater than some value (e.g.-2400°K). This sensor system was designed specifically for the dynamics of a HEAT round attack against an armored vehicle. In this case, the long wavelength signal (4.4 micrometers) drops below the sensor threshold following the HEAT round impact before the short wavelength detectors indicate a color temperature less than the preset value. In aircraft applications, however, this is often not the case and the Lennington system may release suppressant to snuff a flash that would dissipate rapidly by itself. - The general purpose of this invention is to provide a new and improved fire sensor which overcomes the above-described disadvantages of the prior art fire sensors, and which is operable to detect the presence of a fire and cause the release of a fire suppressant.
- It is also a purpose of this invention to provide a new and improved fire sensor that is capable of discriminating between a sudden flash of radiant energy and a fire that develops so soon after the flash that the fire's radiant energy might be interpreted by a detector system as a continuation of the flash.
- To accomplish these purposes while overcoming the disadvantages of the prior art described above, the present invention -electrically simulates what would happen optically in the event there is a flash without a subsequent fire. The timing of the release of fire suppressant does not come so soon that an occasional false alarm results (that is, suppressant is released when a flash occurs but no fire follows), but yet does not come so late that the suppressant is inadequate to extinguish a fire.
- The present invention provides a sensor system of the type disclosed in US-A-4 220 857 comprising a first control signal means responsive to a first radiant energy detector, for generating a first control signal when the first detector detects electromagnetic energy within a first spectral band having an amplitude greater than a first predetermined level; a second control signal means responsive to a second radiant energy detector, for generating a second control signal when the second detector detects electromagnetic energy within a second spectral band having an amplitude greater than a second predetermined level; and a third control signal means responsive to the first and second radiant energy detectors, for generating a third control signal whenever the ratio of the energy detected by the first detector to the amplitude of the energy detected by the second detector exceeds a third predetermined level.
- The sensor system of the invention is characterized by a fourth control signal means for generating a fourth control signal, said fourth control signal means being responsive to said third control signal to generate said fourth control signal in the absence of the third control signal except during a predetermined delay period following a termination of the third control signal; output gate means, responsive to the first, second, and fourth control signals, for generating an output signal only when the first, second, and fourth control signals are all simultaneously generated.
- The output signal, when generated, may be further processed or used to activate electromechanical fire suppression equipment.
- The length of the delay period may be determined in various ways by different types of delay circuits incorporated in the third channel. The type of delay circuit utilized may depend on the type of fire or explosion that might be expected to occur in the monitored area. A simple type of delay circuit is one that merely interrupts the generation of the fifth control signal for a predetermined period of time after the difference between the first and second control signals exceeds the third predetermined level.
-
- Fig. 1 is a block diagram of a three channel sensor system according to a first embodiment of this invention.
- Fig. 2 is a timing diagram showing the operation of the sensor system of Fig. 1.
- Fig. 3 is a block diagram of a three channel sensor system according to a second embodiment of this invention.
- Fig. 4 is a timing diagram showing the operation of the sensor system of Fig. 3.
- In Fig. 1, a three
channel sensor system 10 has aphoton detector 15 that is responsive to radiant energy within a spectral band of relatively short wavelength (0.7 to 1.2 pm, for example), and athermal detector 20 that is responsive to a spectral band of relatively long wavelength (7 to 30 pm, for example). The analog output of eachdetector amplifiers amplifiers amplifiers amplifier 35 is fed to athreshold device 45 having a predetermined threshold level Vn. The output ofamplifier 40 is fed to athreshold device 50 having a predetermined threshold level VT2. Thethreshold devices amplifiers amplifier 35 is below the threshold level VT,, thethreshold device 45 will not generate a control signal (its output is a logical 0); but when the output ofamplifier 35 exceeds the threshold level VT,, thethreshold device 45 will generate a control signal (its output is a logical 1). Thethreshold device 50 operates in a similar manner. The outputs of thethreshold devices AND gate 55. - The outputs of
amplifiers threshold circuit 60. The comparator-threshold circuit 60 generates a logical control signal only when the difference between the amplitudes of its two inputs exceeds a predetermined level. - The output of
amplifier 25 is also fed to arisetime sensing circuit 65, and the output ofamplifier 30 is also fed to anotherrisetime sensing circuit 70. Each risetime sensing circuit generates an analog output that is proportional to the rate of change of its input signal. The output ofrisetime sensing circuit 65, hereinafter called node d, and the output ofrisetime sensing circuit 70, hereinafter called node e, and the output of the comparator-threshold circuit 60, hereinafter called node c, comprise the three inputs to avariable delay circuit 75. Thevariable delay circuit 75 generates a logical control signal for a predetermined fixed period of time after receiving control signals at all three of its input ports. - The outputs of the
amplifiers constant circuit 80 through ganged single-pole switches switches switch driver 90. Theswitch driver 90 is controlled by the output of the comparator-threshold circuit 60. If the comparator-threshold circuit 60 generates a control signal, theswitch driver 90 drives the gangedswitches switches constant circuit 80 receives the outputs ofamplifiers threshold circuit 60 generates its logical control signal (i.e.-if node c is "high"). - When the ganged switches 85 and 86 are closed, the dual time-
constant circuit 80 is charged up by the potentials at nodes a and b. The outputs of the dual time-constant circuit 80, hereinafter called nodes g and h, are fed to adual threshold circuit 95. Thedual threshold circuit 95 converts the analog signals at nodes g and h to logical signals, hereinafter called nodes k and m. The two outputs of thedual threshold circuit 95 are fed to the input ports of an ANDgate 98. - The output of the AND
gate 98, hereinafter called node n, the output of the comparator-threshold circuit 60, and the output of thevariable delay circuit 75, hereinafter called node f, all comprise the inputs to a NORgate 99. The output of the NORgate 99, hereinafter called node p, comprises the third input to the ANDgate 55. The output of the ANDgate 55, hereinafter called node s, is fed to electromechanical fire suppression equipment (not shown). - In most applications, a large amplitude optical signal would take longer to decay than a small amplitude optical signal. Therefore, by charging up a time constant circuit with the amplitude of the optical signal (either long wavelength or short wavelength or both), the decay of the time constant circuit can be used to model or simulate the decay of the optical signal for the case where no fire is produced.
- The risetime variable delay works in a similar fashion. Few stimuli are capable of producing the fast-rising optical signals that occur when an anti-aircraft projectile penetrates the skin of an aircraft. This is especially true at the longer wavelengths. Consequently, a time constant circuit, whose delay increases with risetime of the optical signal would provide a short delay (i.e.-in the range of about 1 to 30 milliseconds) for very fast-rising signals, and would thus release suppressant at about the right time. However, for very slow risetimes, (a few tenths of a second) such as may occur when maintenance personnel are moving about, very long delays (several seconds) could be generated.
- Thus, the advantage of the risetime dependent delay would be an increased immunity to common false-alarm producing stimuli, whereas the amplitude dependent delay would be better able to simulate the decay of the projectile penetration and discriminate more effectively between the flash and a fire.
- The operation of the sensor system of Fig. 1 is shown in the timing diagram of Fig. 2. The scenario depicted in Fig. 2 occurs when a projectile or a piece of flak bursts through the wall of an area monitored by the
sensor system 10 and causes a fire. When the projectile or piece of flak pierces the wall, it causes a flash of radiant energy. The flash comprises a relatively quick-rising short-wavelength component that is detected by thephoton detector 15, causing the waveform shown in Fig. 2 at node a. The flash also comprises a relatively slow-rising long-wavelength component that is detected by thethermal detector 20, causing the waveform shown in Fig. 2 at node b. - As the waveform at node a exceeds the threshold value VTI at time t" the signal at node q rises to a logical 1, where it remains for as long as the waveform at node a remains above the threshold value VT1' As the short wavelength component of the flash continues to rise faster than the long wavelength component, the difference between their amplitudes will cause the comparator-
threshold circuit 60 to generate its logical control signal at time t2. The signal at node c will energize theswitch driver 90 causing it to drive ganged switches 85 and 86 closed, thereby feeding the signals at nodes a and b to the dual time-constant circuit 80 causing the waveforms shown in Fig. 2 at nodes g and h. - When the dual time-
constant circuit 80 charges up, the waveforms at nodes g and h trigger thedual threshold circuit 95 at time t2, generating logical control signals at nodes k and m. Since both input signals to the ANDgate 98 are logical 1's, it generates a logical control signal at time t2. The NORgate 99 generates a logical control signal when all of its inputs are logical 0's. When the comparator-threshold circuit 60 generates its control signal at time t2, the NOR gate's output is inhibited, thereby inhibiting the generation of a control signal at node s. - As the relatively slow-rising long wavelength component of the flash increases, it causes the rise-
time sensing circuit 70 to generate an output. At time t3 the outputs of both risetime sensing circuits are of sufficient magnitude to turn on thevariable delay circuit 75 and cause it to generate a control signal for a predetermined period of time (here t3 to t7). The period of time that the variable delay circuit generates its control signal should be set-such that the fast risetimes caused by the penetration of anti-aircraft fire produces shorter delays than that of the amplitude variable delay circuit. Thus, the amplitude variable delay circuit would dominate in the control of the release of the suppressant for combat battle damage. - For slower risetime signals, however, the
variable delay circuit 75 would be set experimentally such that delays would be incorporated to inhibit against false activation by, for example, the movement of maintenance personnel. - The slow-rising long wavelength component of the flash rises above the threshold level VT2 at time t5 causing a logical 1 waveform at node r. At time ts, the short wavelength component of the decaying flash falls off as the long wavelength component continues to rise, now due to the fire ignited by the projectile or piece of flak. The difference between their amplitudes falls below the threshold level causing the comparator-threshold circuit to cease generating a control signal, as seen at node c at time ts. This causes the ganged switches 85 and 86 to open and the dual time-
constant circuit 80 output to begin decaying. When either of the waveforms at nodes g or h decay below the threshold of thedual threshold circuit 95, one of the inputs (here node k) is removed from the ANDgate 98 at time t7 causing its output to return to a logical 0. - At time t8, the inputs to the NOR
gate 99 will all be logical 0, and the waveform at node p will rise to a logical 1. Therefore, all three inputs to the ANDgate 55 will be logical 1's and the ANDgate 55 will generate an output control signal at time t8. This control signal can be utilized to cause the release of a suppressive material to extinguish the building fire before it is out of control. If no fire resulted from the projectile or piece of flak, the waveform at nodes a and/or b would have been below their respective threshold levels VT, or VT2· In that case, there would have been a logical 0 at node q and/or r, and the ANDgate 55 could not have generated its output control signal at time t8. - The particular circuitry or types of circuits that inhibit the release of a suppressant for a period of time sufficient to allow a flash to dissipate is not limited to those shown in the embodiment of Fig. 1. Another three
channel sensor system 100 is shown in Fig. 3. Thesensor system 100 has aphoton detector 105 and athermal detector 110, each capable of detecting radiant energy within a certain spectral band and generating an output proportional to the amplitude of the detected radiation. Like the system of Fig. 1, the photon detector detects radiation in the 0.7 to 1.2 pm bandwidth, and the thermal detector may operate in the 7 to 30 µm bandwidth. The output of the photon detector is amplified by anamplifier 115 and the output of thethermal detector 110 is amplified by anamplifier 120. - The outputs of the
amplifiers threshold circuit 145. The comparator-threshold circuit generates a control signal at node y whenever the difference between the amplitudes of its input signals exceeds a predetermined threshold value. The outputs of theamplifiers amplifiers threshold circuits threshold circuit 135 generates a control signal at node w if its input exceeds a predetermined threshold value VT3, and thethreshold circuit 140 generates a control signal at node x if its input exceeds a predetermined threshold value VT4. The outputs of thethreshold circuits gate 155. - The delay function of the
sensor system 100 is performed by a fixeddelay circuit 150. The fixeddelay circuit 150 generates a logical control signal at node z in the absence of any input signal from the comparator-threshold circuit 145. When the comparator-threshold circuit 145 generates a logical control signal, the fixeddelay circuit 150 will cease generating its control signal for the duration of the input signal and for a fixed predetermined period of time (delay period) thereafter. Since the output of the fixeddelay circuit 150 comprises the third input to the ANDgate 155, an output control signal at node zz is inhibited for the delay period. - The operation of the
sensor system 100 is shown by the timing diagram of Fig. 4 which uses the same scenario depicted in Fig. 2. When the short wavelength component of the flash rises above its threshold level VT3 at time t", the output of thethreshold circuit 135 will rise to a logical 1 as shown at node w in Fig. 4. When the difference between the amplitudes of waveforms u and v exceeds the threshold value of the comparator-threshold circuit 145 from time tl2 to time t,3, a logical 1 is generated and fed to the fixed delay circuit 150 (node y in Fig. 4). The fixeddelay circuit 150 ceases generating its logical control signal at time tl2 as shown at node z in Fig. 4, and its output remains a logical 0 until the comparator-threshold circuit 145 ceases generating its control signal at time t13 and for a fixed predetermined period of time thereafter (t13 to t15). - At time t14 the long wavelength component of the developing fire causes the waveform at node v to exceed its threshold value VT4 and the
threshold circuit 140 generates a logical 1. When the fixed predetermined period of time of the fixeddelay circuit 150 lapses at time t15, the fixeddelay circuit 150 again generates a logical 1. Since all inputs to the ANDgate 155 are logical 1's, the ANDgate 155 generates an output control signal that may be used to release a suppressant material to extinguish the developing fire.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26920881A | 1981-06-02 | 1981-06-02 | |
US269208 | 1981-06-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0066952A2 EP0066952A2 (en) | 1982-12-15 |
EP0066952A3 EP0066952A3 (en) | 1983-06-01 |
EP0066952B1 true EP0066952B1 (en) | 1986-02-19 |
Family
ID=23026264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82302245A Expired EP0066952B1 (en) | 1981-06-02 | 1982-04-30 | Sensor system responsive to a fire or explosion |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0066952B1 (en) |
JP (1) | JPH0632137B2 (en) |
KR (1) | KR900008377B1 (en) |
AU (1) | AU546773B2 (en) |
DE (1) | DE3269134D1 (en) |
IL (1) | IL65576A (en) |
IN (1) | IN157944B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4679156A (en) * | 1981-05-21 | 1987-07-07 | Santa Barbara Research Center | Microprocessor-controlled fire sensor |
US4469944A (en) * | 1981-11-20 | 1984-09-04 | Santa Barbara Research Center | Optical discriminating fire sensor |
IL65517A (en) * | 1982-04-18 | 1988-02-29 | Spectronix Ltd | Discrimination circuitry for fire and explosion suppression apparatus |
US4765244A (en) * | 1983-04-15 | 1988-08-23 | Spectronix Ltd. | Apparatus for the detection and destruction of incoming objects |
GB2142757B (en) * | 1983-05-21 | 1986-11-26 | Graviner Ltd | Improvements in and relating to fire and explosion detection and suppression |
GB2218189A (en) * | 1987-05-30 | 1989-11-08 | Graviner Ltd | Impact detection |
US7100437B2 (en) * | 2003-11-24 | 2006-09-05 | Advanced Design Consulting Usa, Inc. | Device for collecting statistical data for maintenance of small-arms |
CN112720069B (en) * | 2020-12-22 | 2022-03-22 | 北京工业大学 | Cutter wear monitoring method and device, electronic equipment and storage medium |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4206454A (en) * | 1978-05-08 | 1980-06-03 | Chloride Incorporated | Two channel optical flame detector |
JPS5834555Y2 (en) * | 1978-07-01 | 1983-08-03 | ホーチキ株式会社 | Storage type fire detector |
US4220857A (en) * | 1978-11-01 | 1980-09-02 | Systron-Donner Corporation | Optical flame and explosion detection system and method |
GB2067749B (en) * | 1980-01-17 | 1984-12-12 | Graviner Ltd | Fire and explosion detection |
-
1982
- 1982-04-21 IN IN319/DEL/82A patent/IN157944B/en unknown
- 1982-04-22 IL IL65576A patent/IL65576A/en unknown
- 1982-04-30 EP EP82302245A patent/EP0066952B1/en not_active Expired
- 1982-04-30 DE DE8282302245T patent/DE3269134D1/en not_active Expired
- 1982-05-28 KR KR8202383A patent/KR900008377B1/en active
- 1982-06-01 AU AU84383/82A patent/AU546773B2/en not_active Ceased
- 1982-06-02 JP JP57093258A patent/JPH0632137B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR840000005A (en) | 1984-01-30 |
JPH0632137B2 (en) | 1994-04-27 |
AU546773B2 (en) | 1985-09-19 |
IN157944B (en) | 1986-07-26 |
JPS581288A (en) | 1983-01-06 |
AU8438382A (en) | 1982-12-09 |
IL65576A0 (en) | 1982-07-30 |
EP0066952A3 (en) | 1983-06-01 |
KR900008377B1 (en) | 1990-11-17 |
IL65576A (en) | 1986-03-31 |
EP0066952A2 (en) | 1982-12-15 |
DE3269134D1 (en) | 1986-03-27 |
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