CN112825150A - Multi-frequency electronic seal - Google Patents
Multi-frequency electronic seal Download PDFInfo
- Publication number
- CN112825150A CN112825150A CN201911142703.7A CN201911142703A CN112825150A CN 112825150 A CN112825150 A CN 112825150A CN 201911142703 A CN201911142703 A CN 201911142703A CN 112825150 A CN112825150 A CN 112825150A
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- Prior art keywords
- loop
- chip
- circuit board
- signal
- secondary loop
- Prior art date
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- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000003908 quality control method Methods 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 230000002950 deficient Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07745—Mounting details of integrated circuit chips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Set Structure (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a multi-frequency electronic seal, which comprises a plug and a lock seat. The plug is provided with a circuit board and a detection antenna on the plug. The circuit board is provided with a chip, a main loop and a secondary loop, and the secondary loop is matched with the detection antenna. The lock seat is provided with a main antenna, when the lock seat is locked with the bolt piece, the chip, the main loop and the main antenna are electrically connected to send out a first signal for monitoring the identification host, and the secondary loop is controlled to be electrically connected with the chip and the detection antenna to send out a second signal, wherein the second signal can be used for the mobile phone software to control whether the first signal is normally operated or not, and the first signal and the second signal can be simultaneously cut off when the bolt is damaged. Therefore, the terminal client can actually measure the quality control by the mobile phone.
Description
Technical Field
The invention is especially suitable for disposable use, because the terminal customer can first use the mobile phone to measure the technology of whether the electronic seal is operating normally.
Background
As approved by the present inventors in US08558700B2, US08866609B2 and US09508271B2, the aforementioned documents have spring integrally formed in the lock seat, so as to maintain the structural strength of the spring, the movement margin of the spring is not large, but there are tolerance when the circuit board is mounted on the plug and tolerance when the plug lock is locked in the lock seat, so that the bad products of the accumulated tolerance affecting the movement margin of the spring are avoided, and the plug and the lock seat are manufactured and qualified.
Disclosure of Invention
The invention mainly aims to provide a multi-frequency electronic seal which can enable a terminal customer to actually measure a quality control through a mobile phone, so that defective products are avoided.
To achieve the above object, the present invention adopts the following means.
A multi-frequency electronic seal at least comprises: a plug, which is composed of a circuit board and a detection antenna mounted on the plug; the circuit board is provided with a chip, a main loop and a secondary loop, the main loop and the secondary loop are configured without conducting each other, and the secondary loop is matched with the detection antenna; and a lock seat, it installs the main aerial, when the lock seat is used for the bolt piece to lock, make chip, main loop and main aerial electric connection and send out and support the first signal monitored, and control the secondary loop electric connection chip and detect the aerial and send out the second signal, the second signal can be used for the mobile phone software product to manage the first signal and normally operate, this first signal and second signal present different frequency channel configuration, can interrupt main loop and secondary loop and cut off the first signal and second signal when destroying the bolt.
Furthermore, the plug is provided with a starting unit for controlling the secondary loop and the detection antenna to keep open circuit, but after the plug locks the lock seat, a differential motion can be generated between the circuit board and the plug piece, so that the circuit board can switch the starting unit to control the detection antenna, the secondary loop and the chip to be electrically connected to send out a second signal.
Further, the starting unit adopts a switch.
Furthermore, the detecting antenna, the secondary loop and the chip are matched into a closed loop and are installed on the circuit board together.
Further, the detecting antenna, the secondary loop and the chip are serially arranged.
Furthermore, the bolt piece is provided with a rod body, a cap head which is radially expanded at the top end of the rod body, and an accommodating hole which penetrates through the top surface and the bottom surface; the circuit board is provided with a necking section which can be inserted into the containing hole, and the necking section is provided with a main loop and a secondary loop; the circuit board is additionally provided with an external expanding section above the necking section, the external expanding section is positioned on the cap head, the top end of the external expanding section is provided with a starting unit, the surface of the external expanding section is provided with a detection antenna, the periphery of the external expanding section and the cap head is coated with a waterproof sleeve, a gap is kept between the top end of the external expanding section and the waterproof sleeve for releasing the starting unit, the starting unit is enabled to disconnect the electrical connection of the detection antenna, the secondary loop and the chip, but after the plug is locked on the locking seat, the circuit board can move upwards to reduce the gap, the starting unit is enabled to be pressed against the waterproof sleeve, and the detection antenna, the secondary loop and the chip are further.
Furthermore, the primary loop at least comprises a lower contact point arranged at the bottommost surface of the necking section, a starting end and a terminal end which are arranged above the lower contact point, the secondary loop comprises a starting end and a terminal end which are arranged above the lower contact point, and the chip is arranged among the starting end, the terminal end, the starting end and the terminal end so that the chip and the primary loop can emit an RFID frequency band or a microwave frequency band; the detection antenna is spirally arranged on the surface of the external expansion section, and is controlled to be matched with the secondary loop and the chip through the starting end and the tail end so as to emit a magnetic field frequency band capable of providing a mobile phone software product.
Furthermore, the detecting antenna is arranged on the top surface of the bolt, and the bottom end of the circuit board of the main loop is provided with a lower contact matched with the main antenna, so that the main antenna and the detecting antenna are controlled to keep the maximum distance.
Further, the chip is at least split into a first part matched with the primary loop and a second part matched with the secondary loop.
Furthermore, the bolt piece is provided with a rod body, a cap head which is radially expanded at the top end of the rod body, and an accommodating hole which penetrates through the top surface and the bottom surface; the circuit board is provided with a containing hole, the detection antenna is fixedly arranged on the top surface of the cap head through a carrier, and further controls a secondary loop, a second part and the detection antenna to form a closed loop through a bolt piece, wherein the bottom edge of the secondary loop is provided with an elastic contact pin capable of abutting against the wall surface of the containing hole, the top end of the circuit board is provided with an upper contact, and the starting unit provides pre-pressure for the circuit board to ensure that a potential difference is kept between the upper contact and the detection antenna, but the potential difference can be overcome after the bolt locking seat is locked, so that the upper contact is electrically connected with the second part and the detection antenna, and a second signal capable of being used for the mobile phone software to actually measure the quality control tube is sent out.
After the technical means is adopted, the circuit board of the electronic seal is provided with the chip, the main loop and the secondary loop, and the secondary loop is matched with a detection antenna. When the plug and the lock seat are used, the main loop, the chip and the main antenna of the lock seat can be electrically connected to send out a first signal for monitoring the identification host, and the secondary loop, the chip and the detection antenna can be controlled to be electrically connected to send out a second signal, so that the second signal can be used for the mobile phone software to actually measure whether the first signal is normally operated or not, and the first signal and the second signal can be simultaneously cut off when the plug is damaged. Therefore, the terminal client can actually measure the product through the mobile phone, and defective products are avoided.
Drawings
FIG. 1 is an exploded view of the present invention.
Fig. 2 is a front view of the circuit board of the present invention.
Fig. 3 is a rear view of the circuit board of the present invention.
FIGS. 4 and 5 are schematic views showing the positions of the bolt, the container door bolt and the lock bracket according to the present invention.
FIG. 6 is a sectional view of the bolt and the keeper of the present invention in a locked position.
FIG. 7 is a cross-sectional view of the tamper plug of the present invention.
Fig. 8 and 9 are exploded views of a second embodiment of the plug of the present invention.
FIG. 10 is an assembled cross-sectional view of a second embodiment of the plug of the present invention.
[ notation ] to show
A bolt
10 bolt
11 shaft
12 head of cap
13 hole
14 engaging arrangement
20 circuit board
201 necking down segment
202 outer expanding section
21 main loop
211 lower contact
212 starting end
213 terminal
22-time loop
221 beginning
222 end of the tube
223 elastic contact pin
224 upper contact
23 chip
231 first part
232 second part
24 detection antenna
240 carrier
25 starting unit
W waterproof jacket
G gap
B lock seat
30 outer cover
31 first shell
32 second shell
33 rail plate
330 sliding space
34 lock hole
35 elastic unit
40 clasp
50 main antenna
51 limiting part
52 concave space
53 upper contact
And C, a bolt.
Detailed Description
As shown in FIGS. 4 to 7, the electronic seal is composed of a bolt A and a lock seat B, wherein the bolt A can lock the lock seat B from top to bottom to lock the door bolt C of the container for the customs identification host to monitor whether the container is normally opened.
Referring to fig. 1 to 7, the plug a is mainly formed by mounting a circuit board 20 and a detection antenna 24 on a plug 10; wherein;
the bolt 10 is made of a metal material with a stronger structure, and comprises a rod body 11, a cap head 12 radially expanded at the top end of the rod body 11, and a containing hole 13 penetrating through the top surface and the bottom surface, wherein the lower peripheral ring of the bolt 10 is concavely provided with a clamping configuration 14;
the circuit board 20 has a necking section 201 capable of being inserted into the receiving hole 13 from top to bottom, and an outward expanding section 202 is disposed above the necking section 201, so that the bottom end of the outward expanding section 202 can be positioned on the cap head 12, so that the necking section 201 can be suspended in the receiving hole 13; the circuit board 20 further has a main loop 21 disposed in front of the necking section 201 and a secondary loop 22 disposed behind the necking section 201, so that the main loop 21 and the secondary loop 22 can be disposed above and below the necking section 201 in a wide range and can be kept non-conductive, wherein the main loop 21 at least includes a lower contact 211 disposed at the bottommost surface of the necking section 201, a start end 212 disposed at the top edge of the necking section 201, and a terminal end 213 disposed at the top edge of the necking section 201, the secondary loop 22 further includes a start end 221 and a terminal end 222 disposed at the top edge of the necking section 201, so that a chip 23 can be mounted between the start end 212, the terminal end 213, the start end 221, and the terminal end 222, so that the chip 23 and the main loop 21 can emit an RFID frequency band or a microwave frequency band, and the chip 23 and the secondary loop 22 emit a magnetic frequency band capable of providing a mobile phone software product, the magnetic frequency band can be an NFC system or an LF system, in other words, the chip 23 is a, the pins can at least send out two different frequency bands, and the pins are the corresponding connection starting end 212, terminal end 213, starting end 221 and terminal end 222; the surface of the external expanding section 202 is provided with a spiral detecting antenna 24, and the detecting antenna 24 is controlled to match with the secondary loop 22 and the chip 23 to form a closed loop through a start end 221 and a tail end 222, the closed loop shown in the drawing is selected to be connected in series, the top edge of the external expanding section 202 is additionally provided with a starting unit 25, the starting unit 25 can adopt a micro-motion type switch as shown in the drawing, the starting unit 25 is enabled to disconnect the detecting antenna 24 and the secondary loop 22, in addition, the external expanding section 202 and the periphery of the cap head 12 are coated with a waterproof sleeve W as shown in figures 4 to 7, so as to reliably assemble the circuit board 20 on the bolt 10, as shown in figure 5, a gap G is kept between the top end of the circuit board 20 and the waterproof sleeve W, so as to release the starting unit 25, so that the starting unit 25 keeps disconnecting the electric connection of the detecting antenna 24, the secondary loop 22 and the chip 23 of the closed loop, and the lower contact 211 is at the maximum position of the, so that when the lower contact 211 is pushed to move upward by a set distance, because the waterproof jacket W is fixed on the cap head 12, a differential motion is generated between the circuit board 20 and the plug 10, so that the circuit board 20 can move upward to reduce the gap G, and the starting unit 25 is switched by pressing the waterproof jacket W, so as to quickly and electrically connect the detection antenna 24, the secondary loop 22 and the chip 23 of the closed loop;
please refer to fig. 1, 4 and 5, the lock seat B is composed of a housing 30, a retaining ring 40 and a main antenna 50, wherein the housing 30 is formed by a first shell 31 and a second shell 32, and a plurality of rail plates 33 are formed inside the housing for setting the sliding space 330 shown in fig. 5 and 6, the housing 30 is provided with a lock hole 34 communicating with the top end of the middle section of the sliding space 330 from top to bottom, the retaining ring 40 is installed in the lock hole 34, the housing 30 is integrally formed with an elastic unit 35 right below the lock hole 34, the main antenna 50 is slidably fitted in the sliding space 330, the bottom end of the middle section is provided with a limiting portion 51 for inserting the free end of the elastic unit 35, so that the main antenna 50 has a potential of positioning an upper dead point at any time, the top end of the middle section of the main antenna 50 is provided with a recessed space 52 downward, and the bottom surface of the recessed space 52 is provided with an upper contact 53;
please refer to fig. 5 and 6, when the lower portion of the bolt 10 is inserted into the lock hole 34 for locking the door bolt C of the container, and during the insertion process, when the connection point 211 enters the concave space 52 and an electrical connection is connected to the connection point 53, the chip 23, the primary loop 21 and the primary antenna 50 can send out a first signal of RFID frequency band or microwave frequency band for the customs host to perform identification management, and then overcome the elastic unit 35 to clamp and position the clamping configuration 14 on the retaining ring 40, so that the bolt 10 cannot be separated from the lock seat B, at this time, the elastic unit 35 can pre-press to push the circuit board 20 upward, so that the starting unit 25 touches the waterproof cover W for switching, so that the detecting antenna 24, the secondary loop 22 and the chip 23 are electrically connected to send out a second signal of magnetic field frequency band, so that the second signal can be used for the mobile phone software to determine whether the first signal is normally operating or not, thereby allowing the terminal customer to intercept the defective product, so as to ensure the effective supervision of the container locking, therefore, the first signal and the second signal are configured in different frequency bands; as shown in FIG. 7, if the door bolt C of the container is opened normally, the oil hydraulic shear is used to break the bolt 10 from it, so as to simultaneously cut off the primary circuit 21 and the secondary circuit 22 of the circuit board 20, thereby interrupting the first and the second signals.
The first signal and the second signal can be built with the same serial number (identification code) so that the mobile phone and the customs host can sufficiently judge whether the containers indicated by the serial numbers are the same.
The invention has the following advantages:
firstly, the plug A sends out a first signal in the process of locking the lock seat B, and then sends out a second signal, so that the second signal can be used for the mobile phone software to actually measure whether the first signal is normally operated or not, thereby enabling a terminal client to intercept defective products and enabling a customs host to really monitor.
Secondly, in the process of locking the lock seat B, the plug A of the invention utilizes the difference generated between the circuit board 20 and the bolt 10 to make the circuit board 20 be pushed by the main antenna 50 to move upwards to switch the starting unit 25, so as to make the detection antenna 24, the secondary loop 22 and the chip 23 of the closed loop send out the second signal, and this configuration can ensure that the detection antenna 24 and the secondary loop 22 will not send out the second signal at any time when the plug A is not locked on the lock seat B, thus the situation of misjudging the first signal can be eliminated.
Third, the invention controls the maximum distance between the main antenna 50 and the detecting antenna 24 by installing the detecting antenna 24 above the bolt 10, arranging the main loop 21 and the secondary loop 22 in a non-conductive configuration, and arranging the main antenna 50 below the bolt 10 relatively, so as to minimize the interference between the second signal and the first signal.
Referring now to fig. 8 and 10, a second embodiment of a plug a of the present invention is shown, illustrating at least the following equivalent embodiments of the invention:
firstly, the chip of the invention is at least split into a first part 231 matched with the main loop 21 and a second part 232 matched with the secondary loop 22;
secondly, the detecting antenna 24 of the present invention is configured separately from the circuit board 20, and the detecting antenna 24 is horizontally fixed on the top surface of the cap head 12 through a carrier 240;
third, the second portion 232 of the chip 23 of the present invention is mounted on the carrier 240, but not necessarily mounted on the circuit board 20;
fourth, the secondary loop 22, the second part 232, and the detecting antenna 24 of the present invention can form a closed loop through the bolt 10, so that the bolt 10 can increase the second signal strength after the latch a is locked in the locking seat B, and the mobile phone can receive signals more easily, specifically, the secondary loop 22 needs to be provided with an elastic contact pin 223 at the bottom edge, which can be abutted against the wall surface of the accommodating hole 13, and an upper contact 224 at the top end of the circuit board 20, and the starting unit 25 provides a pre-pressure to the circuit board 20, so that a potential difference is maintained between the upper contact 224 and the detecting antenna 24, but the potential difference can be overcome after the latch a is locked in the locking seat B, so that the upper contact 224 is electrically connected to the second part 232 and the detecting antenna 24, thereby sending out a second signal for the mobile phone software to actually measure the quality control.
Claims (10)
1. A multi-frequency electronic seal, comprising:
a plug, which is composed of a circuit board and a detection antenna mounted on the plug; the circuit board is provided with a chip, a main loop and a secondary loop, the main loop and the secondary loop are configured in a non-conductive way, and the secondary loop is matched with the detection antenna; and
the lock seat is provided with a main antenna, when the lock seat is used for locking the bolt piece, the chip, the main loop and the main antenna are electrically connected to send out a first signal for monitoring, the secondary loop is controlled to be electrically connected with the chip and the detection antenna to send out a second signal, the second signal is used for the mobile phone software to control whether the first signal normally operates or not, the first signal and the second signal are configured in different frequency bands, and the main loop and the secondary loop can be interrupted to cut off the first signal and the second signal when the bolt is damaged.
2. The multi-frequency electronic seal of claim 1, wherein: the plug is provided with a starting unit for controlling the secondary loop and the detection antenna to keep open circuit, but after the plug locks the lock seat, a differential motion can be generated between the circuit board and the plug piece, so that the circuit board can switch the starting unit to control the detection antenna, the secondary loop and the chip to be electrically connected to send out a second signal.
3. The multi-frequency electronic seal of claim 2, wherein: the starting unit adopts a switch.
4. The multi-frequency electronic seal of claim 2, wherein: the detection antenna, the secondary loop and the chip are matched to form a closed loop and are installed on the circuit board together.
5. The multi-frequency electronic seal of claim 4, wherein: the detection antenna, the secondary loop and the chip are configured in series.
6. The multi-frequency electronic seal of claim 2, 3, 4 or 5, wherein: the bolt piece is provided with a rod body, a cap head which radially expands outwards at the top end of the rod body, and a containing hole which penetrates through the top surface and the bottom surface; the circuit board is provided with a necking section which can be inserted into the containing hole, and the necking section is provided with a main loop and a secondary loop; the circuit board is additionally provided with an external expanding section above the necking section, the external expanding section is positioned on the cap head, the top end of the external expanding section is provided with a starting unit, the surface of the external expanding section is provided with a detection antenna, the periphery of the external expanding section and the cap head is coated with a waterproof sleeve, a gap is kept between the top end of the external expanding section and the waterproof sleeve for releasing the starting unit, the starting unit is enabled to disconnect the electrical connection of the detection antenna, the secondary loop and the chip, but after the plug is locked on the locking seat, the circuit board can move upwards to reduce the gap, the starting unit is enabled to be pressed against the waterproof sleeve, and the detection antenna, the secondary loop and the chip are further.
7. The multi-frequency electronic seal of claim 6, wherein: the primary loop at least comprises a lower contact point arranged at the bottommost surface of the necking section, a starting end and a terminal end which are arranged above the lower contact point, the secondary loop comprises a starting end and a terminal end which are arranged above the lower contact point, and the chip is arranged among the starting end, the terminal end, the starting end and the terminal end so that the chip and the primary loop can emit an RFID frequency band or a microwave frequency band; the detection antenna is spirally arranged on the surface of the external expansion section, and is controlled to be matched with the secondary loop and the chip through the starting end and the tail end so as to emit a magnetic field frequency band for the mobile phone software product.
8. The multi-frequency electronic seal of claim 1, 2, 3, 4 or 5, wherein: the detection antenna is arranged on the top surface of the bolt, and the bottom end of the circuit board of the main loop is provided with a lower contact matched with the main antenna, so that the main antenna and the detection antenna are controlled to keep the maximum distance.
9. The multi-frequency electronic seal of claim 2, wherein: the chip is at least split into a first part matched with the primary loop and a second part matched with the secondary loop.
10. The multi-frequency electronic seal of claim 9, wherein: the bolt piece is provided with a rod body, a cap head which radially expands outwards at the top end of the rod body, and a containing hole which penetrates through the top surface and the bottom surface; the circuit board is provided with a containing hole, the detection antenna is fixedly arranged on the top surface of the cap head through a carrier, and further controls a secondary loop, a second part and the detection antenna to form a closed loop through a bolt piece, wherein the bottom edge of the secondary loop is provided with an elastic contact pin capable of abutting against the wall surface of the containing hole, the top end of the circuit board is provided with an upper contact, and the starting unit provides pre-pressure to the circuit board to keep a potential difference between the upper contact and the detection antenna, but can overcome the potential difference after the bolt locking seat is locked, so that the upper contact is electrically connected with the second part and the detection antenna, and a second signal for the mobile phone software to actually measure the quality control tube is sent out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911142703.7A CN112825150B (en) | 2019-11-20 | 2019-11-20 | Multi-frequency electronic seal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911142703.7A CN112825150B (en) | 2019-11-20 | 2019-11-20 | Multi-frequency electronic seal |
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| CN112825150A true CN112825150A (en) | 2021-05-21 |
| CN112825150B CN112825150B (en) | 2024-02-23 |
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