CN112435360A - Attendance system capable of being used for managing mobile phone - Google Patents
Attendance system capable of being used for managing mobile phone Download PDFInfo
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- CN112435360A CN112435360A CN202011320534.4A CN202011320534A CN112435360A CN 112435360 A CN112435360 A CN 112435360A CN 202011320534 A CN202011320534 A CN 202011320534A CN 112435360 A CN112435360 A CN 112435360A
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- attendance
- control device
- mobile phone
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- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000012795 verification Methods 0.000 claims abstract description 17
- 230000017525 heat dissipation Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000009423 ventilation Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
- G07C1/10—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people together with the recording, indicating or registering of other data, e.g. of signs of identity
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
- G07F17/10—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for means for safe-keeping of property, left temporarily, e.g. by fastening the property
- G07F17/12—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for means for safe-keeping of property, left temporarily, e.g. by fastening the property comprising lockable containers, e.g. for accepting clothes to be cleaned
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F9/00—Details other than those peculiar to special kinds or types of apparatus
- G07F9/10—Casings or parts thereof, e.g. with means for heating or cooling
- G07F9/105—Heating or cooling means, for temperature and humidity control, for the conditioning of articles and their storage
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Thermal Sciences (AREA)
- Computer Networks & Wireless Communication (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention discloses an attendance system capable of being used for managing a mobile phone, which comprises a shell, wherein an attendance mechanism and a heat dissipation unit are arranged on the shell, the attendance mechanism is used for verifying personal information and comprises an information verification unit and an operation keyboard; the mobile phone comprises a shell, an information verification unit, an operation keyboard, a temperature detection device, a heat dissipation unit and a storage box, wherein the shell is internally provided with the control device, the temperature detection device and the storage box for storing the mobile phone; according to the attendance system, students or examinees can check in through the information verification unit and select whether to store the mobile phone or not through the operation keyboard, so that the applicability of the attendance system is improved; if the mobile phone needs to be stored, the control device matches the personal information of the student or the examinee with the number of the storage box, namely the storage box corresponds to the personal information one by one, and the safety factor of mobile phone management is improved.
Description
Technical Field
The invention relates to the technical field of attendance equipment, in particular to an attendance system capable of being used for managing a mobile phone.
Background
In the current school, a teacher needs to check attendance and register the attendance of students or examiners before class or examination, but the current attendance mode generally adopts a mode of oral roll call or a mode of signature and registration of a paper check-in form, so that the time required for completing the attendance task is long, the condition of answer or signature replacement is difficult to avoid, and the reliability and the effectiveness of the attendance result are reduced.
In the prior art, when an examination is carried out, part of students who do not carry backpacks can store the mobile phone in a cloth bag for managing the mobile phone, but when the mobile phone is taken away, the probability that the mobile phone is taken by mistake is high, and the safety factor is lower.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an attendance system for managing a mobile phone, which can be used for attendance registration of students or examinees and mobile phone management, and improves the applicability of the attendance system.
In order to achieve the purpose, the invention adopts the following technical scheme:
an attendance system capable of being used for managing a mobile phone comprises a shell, wherein an attendance mechanism used for verifying personal information and a heat dissipation unit are arranged on the shell, and the attendance mechanism comprises an information verification unit and an operation keyboard; the mobile phone comprises a shell, and is characterized in that a control device, a temperature detection device and a plurality of storage boxes for storing mobile phones are arranged in the shell, an information verification unit, an operation keyboard, the temperature detection device, a heat dissipation unit and the storage boxes are respectively electrically connected with the control device, and the control device can control the storage boxes to be opened or closed.
In the attendance system capable of being used for managing the mobile phone, the control device comprises a power supply unit, and the power supply unit is used for providing stable working voltage for the control device, the attendance mechanism, the storage box and the heat dissipation unit; the power supply unit comprises a first power supply device and a second power supply device, and the first power supply device and the second power supply device are respectively electrically connected with the control device.
The attendance system capable of being used for managing the mobile phone is characterized in that the information verification unit comprises a fingerprint reader for reading personal fingerprint information and an IC card reader for reading student card information, and the fingerprint reader and the IC card reader are respectively and electrically connected with the control device.
The attendance system capable of being used for managing the mobile phone comprises a wireless communication unit and a storage unit, wherein the wireless communication unit is used for realizing wireless communication connection between the attendance system and an external controller, and the storage unit is used for storing personal information.
The attendance checking mechanism comprises an information reading port, the information reading port is used for exporting data to an external controller, and the information reading port is electrically connected with the control device.
The attendance system capable of being used for managing the mobile phone is characterized in that the attendance mechanism further comprises a display unit, the control device further comprises a two-dimensional code generation unit, the display unit is used for displaying information output by the control device, the two-dimensional code generation unit is used for generating a two-dimensional code capable of acquiring attendance information, and the display unit is electrically connected with the control device.
The attendance system capable of being used for managing the mobile phone is characterized in that an electric control lock is arranged on the storage box and is electrically connected with the control device.
The attendance system capable of being used for managing the mobile phone is characterized in that a spring lock is arranged on the storage box.
The attendance system capable of being used for managing the mobile phone is characterized in that the heat dissipation unit comprises a first ventilation fan and a second ventilation fan which are arranged on the shell, the first ventilation fan and the second ventilation fan are arranged oppositely, and the first ventilation fan and the second ventilation fan are respectively electrically connected with the control device.
Has the advantages that:
the invention provides an attendance system for managing a mobile phone, which has the following advantages:
(1) the attendance checking system comprises an information verification unit and an operation keyboard, students or examinees can check in attendance through the information verification unit, and whether the mobile phone needs to be stored or not is selected through the operation keyboard, so that the applicability of the attendance checking system is improved;
(2) when the mobile phone is stored, the control device matches personal information of students or examinees with the serial numbers of the storage boxes, namely the storage boxes correspond to the personal information one by one, so that the safety factor of the attendance system in the process of managing the mobile phone is improved, and the problem that the mobile phone is taken by mistake is avoided;
(3) be provided with temperature-detecting device and radiating element in the casing, avoid the inside temperature of casing overheated, the degree of safety when improving attendance system and using.
Drawings
Fig. 1 is a schematic structural diagram of an attendance system provided by the invention;
fig. 2 is a system structure diagram of the attendance system provided by the invention;
fig. 3 is a system structure diagram of an embodiment of the attendance system provided by the invention.
Description of the main element symbols: the system comprises a shell 1, a attendance checking mechanism 2, an information verification unit 21, a fingerprint reader 211, an IC card reader 212, an operation keyboard 22, an information reading port 23, a display unit 24, a heat dissipation unit 3, a first ventilating fan 31, a storage box 4, a spring lock 41, a temperature detection device 5, a control device 6, a power supply unit 61, a first power supply device 611, a second power supply device 612, a wireless communication unit 62, a storage unit 63 and a two-dimensional code generation unit 64.
Detailed Description
The invention provides an attendance system for managing a mobile phone, which is further described in detail below by referring to the attached drawings and embodiments in order to make the purpose, technical scheme and effect of the invention clearer and clearer.
In the description of the present invention, it is to be understood that the terms "mounted," "connected," and the like are to be interpreted broadly, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
Referring to fig. 1 to 3, the present invention provides an attendance system for managing a mobile phone, including a housing 1, wherein an attendance mechanism 2 for verifying personal information and a heat dissipation unit 3 are disposed on the housing 1, and the attendance mechanism 2 includes an information verification unit 21 and an operation keyboard 22; the shell 1 is internally provided with a control device 6, a temperature detection device 5 and a plurality of storage boxes 4 for storing the mobile phone, the information verification unit 21, the operation keyboard 22, the temperature detection device 5, the heat dissipation unit 3 and the storage boxes 4 are respectively electrically connected with the control device 6, and the control device 6 can control the storage boxes 4 to be opened or closed; in one embodiment, the temperature detecting device 5 is a temperature sensor, and the control device 6 includes a control circuit board on which a control chip of STM32 series is disposed.
The attendance system capable of being used for managing the mobile phone comprises an information verification unit 21 and an operation keyboard 22, students or examinees can check in attendance through the information verification unit 21 and select whether to store the mobile phone through the operation keyboard 22, and therefore the applicability of the attendance system is improved; when a student or an examinee selects to store the mobile phone, the control device 6 selects a storage box 4 without the mobile phone, and records the number of the selected storage box 4, so that the personal information of the student or the examinee is matched with the number of the storage box 4, namely the storage boxes 4 correspond to the personal information one by one, the safety factor of the attendance system in managing the mobile phone is improved, and the problem that the mobile phone is taken by mistake is avoided; further, because the cell-phone can generate heat in the operation process, when a plurality of cell-phones are deposited in relative inclosed casing 1, the condition that the temperature is too high may appear, in order to avoid the condition such as cell-phone explosion that leads to appearing because the temperature is too high, the attendance system that this application discloses sets up temperature-detecting device 5 and radiating element 3 in casing 1, when the real-time temperature that temperature-detecting device 5 feedbacks is greater than or equal to the highest temperature of predetermineeing in controlling means 6, the highest temperature can be 45 degrees centigrade, controlling means 6 control radiating element 3 begins work, reduce the inside temperature of casing 1, the degree of safety when improving the attendance system and using.
Further, referring to fig. 2 and 3, the control device 6 includes a power supply unit 61, and the power supply unit 61 is configured to provide a stable operating voltage for the control device 6, the attendance checking mechanism 2, the storage box 4, and the heat dissipation unit 3; the power supply unit 61 comprises a first power supply device 611 and a second power supply device 612, the first power supply device 611 and the second power supply device 612 are respectively electrically connected with the control device 6, the control device 6 monitors the working conditions of the first power supply device 611 and the second power supply device 612 in real time by detecting current information and voltage information of the first power supply device 611 and current information and voltage information of the second power supply device 612, if the first power supply device 611 is abnormal in working, the control device 6 controls to switch to the second power supply device 612 for supplying power and outputs alarm information to remind a worker to repair and replace the power supply devices; if the second power supply device 612 works abnormally, the first power supply device 611 is switched to supply power; the first power supply device 611 and the second power supply device 612 are arranged, so that the situation that a user cannot take and place a mobile phone when power supply is abnormal can be avoided, and the attendance system can work effectively for a long time.
Further, referring to fig. 1 to 3, the information verification unit 21 includes a fingerprint reader 211 for reading personal fingerprint information and an IC card reader 212 for reading student card information, and the fingerprint reader 211 and the IC card reader 212 are electrically connected to the control device 6 respectively; the fingerprint information and the student IC card information of students or examinees needing attendance checking can be input and stored in the control device 6 in advance, the students or the examinees can select to use the fingerprint reader 211 to sign in through fingerprint authentication or to sign in through the IC card reader 212 through student IC card authentication, namely, the attendance checking system provides multiple sign-in modes for users to select, and the applicability and the use experience of the users of the attendance checking system are improved.
Further, referring to fig. 2 and fig. 3, the control device 6 includes a wireless communication unit 62 and a storage unit 63, the wireless communication unit 62 is used for realizing wireless communication connection between the attendance system and the external controller, and the attendance system can also obtain personal information from the external controller through the wireless communication unit 62; the storage unit 63 is used for storing personal information including fingerprint information and IC card information; in one embodiment, the wireless communication unit 62 may be a WIFI chip or a WLAN chip disposed on the control circuit board; the storage unit 63 may be a memory, and the memory is connected with the control circuit board; the external controller may be a central management system of a school administration.
Further, referring to fig. 1 to 3, the attendance mechanism 2 further includes an information reading port 23, the information reading port 23 is used for exporting data to an external controller, and the information reading port 23 is electrically connected to the control device 6; in one embodiment, the information reading port 23 may be a USB interface, and the staff member may read the attendance information recorded in the storage unit 63 through the information reading port 23.
Further, referring to fig. 1 to 3, the attendance mechanism 2 further includes a display unit 24, the control device 6 further includes a two-dimensional code generating unit 64, the display unit 24 is configured to display information output by the control device 6, the two-dimensional code generating unit 64 is configured to generate a two-dimensional code capable of acquiring attendance information, and the display unit 24 is electrically connected to the control device 6; the working personnel can input a control instruction for generating the two-dimensional code to the control device 6 through the operation keyboard 22, after the control device 6 receives the control instruction, the two-dimensional code generating unit 64 is controlled to generate the two-dimensional code carrying attendance information and display the two-dimensional code through the display unit 24, and the working personnel can scan the two-dimensional code to obtain the attendance information; the display unit 24 can also display real-time and attendance information, students or examinees can confirm the attendance time through the time displayed by the display unit 24, and workers can also input a control instruction for displaying the attendance information to the control device 6 through the operation keyboard 22, so that the workers can directly check the attendance information through the display unit 24, and the applicability of the attendance system is improved; in one embodiment, the display unit 24 is a display screen.
Furthermore, the storage box 4 is provided with an electric control lock which is electrically connected with the control device 6, the control device 6 outputs a control instruction to control the electric control lock to be opened or closed, when the electric control lock is opened, the storage box 4 is bounced outwards, so that students or examinees can conveniently confirm the position of the storage box 4 in which the mobile phone needs to be stored or the position of the storage box 4 in which the mobile phone is stored, and the mobile phone can be conveniently stored and taken out; in one embodiment, the electrically controlled lock may be an electromagnetic lock.
Further, referring to fig. 1, a pin tumbler lock 41 is arranged on the storage box 4, and the pin tumbler lock 41 is used as a redundant design for taking and placing the mobile phone, so that when the electric control lock fails and cannot work normally or is damaged, the storage box 4 can be opened by matching a key with the pin tumbler lock 41 to store the mobile phone, the applicability of the attendance system is improved, and the use experience of a user is improved.
Further, referring to fig. 1, the heat dissipation unit 3 includes a first ventilation fan 31 and a second ventilation fan disposed on the housing 1, the first ventilation fan 31 and the second ventilation fan are disposed opposite to each other, and the first ventilation fan 31 and the second ventilation fan are respectively electrically connected to the control device 6; when the internal temperature of the housing 1 is greater than or equal to the preset maximum temperature, the control device 6 controls the first ventilation fan 31 and the second ventilation fan to be simultaneously opened so as to improve the flowing effect of the air inside the housing 1, thereby reducing the internal temperature of the housing 1 and improving the safety degree of the attendance system during use.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (9)
1. An attendance system capable of being used for managing a mobile phone is characterized by comprising a shell, wherein an attendance mechanism and a heat dissipation unit for verifying personal information are arranged on the shell, and the attendance mechanism comprises an information verification unit and an operation keyboard; the mobile phone comprises a shell, and is characterized in that a control device, a temperature detection device and a plurality of storage boxes for storing mobile phones are arranged in the shell, an information verification unit, an operation keyboard, the temperature detection device, a heat dissipation unit and the storage boxes are respectively electrically connected with the control device, and the control device can control the storage boxes to be opened or closed.
2. The attendance system capable of being used for managing a mobile phone according to claim 1, wherein the control device comprises a power supply unit for supplying a stable operating voltage to the control device, the attendance mechanism, the storage box and the heat dissipation unit; the power supply unit comprises a first power supply device and a second power supply device, and the first power supply device and the second power supply device are respectively electrically connected with the control device.
3. The attendance system capable of being used for managing a mobile phone according to claim 1, wherein the information verification unit comprises a fingerprint reader for reading personal fingerprint information and an IC card reader for reading student card information, and the fingerprint reader and the IC card reader are respectively electrically connected with the control device.
4. The attendance system as claimed in claim 1, wherein the control means includes a wireless communication unit for realizing wireless communication connection between the attendance system and an external controller, and a storage unit for storing personal information.
5. The attendance system as claimed in claim 4, wherein the attendance mechanism further comprises an information reading port for exporting data to an external controller, the information reading port being electrically connected to the control device.
6. The attendance system capable of being used for managing the mobile phone according to claim 4, wherein the attendance mechanism further comprises a display unit, the control device further comprises a two-dimensional code generation unit, the display unit is used for displaying the information output by the control device, the two-dimensional code generation unit is used for generating a two-dimensional code capable of acquiring attendance information, and the display unit is electrically connected with the control device.
7. The attendance system as claimed in claim 1, wherein an electrically controlled lock is provided on the storage box, and the electrically controlled lock is electrically connected to the control device.
8. The attendance system capable of being used for managing a mobile phone according to claim 1, wherein a pin tumbler lock is arranged on the storage box.
9. The attendance system capable of being used for managing the mobile phone according to claim 1, wherein the heat dissipation unit comprises a first ventilation fan and a second ventilation fan which are arranged on the housing, the first ventilation fan and the second ventilation fan are arranged oppositely, and the first ventilation fan and the second ventilation fan are respectively electrically connected with the control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320534.4A CN112435360A (en) | 2020-11-23 | 2020-11-23 | Attendance system capable of being used for managing mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320534.4A CN112435360A (en) | 2020-11-23 | 2020-11-23 | Attendance system capable of being used for managing mobile phone |
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| Publication Number | Publication Date |
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| CN112435360A true CN112435360A (en) | 2021-03-02 |
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|---|---|---|---|
| CN202011320534.4A Pending CN112435360A (en) | 2020-11-23 | 2020-11-23 | Attendance system capable of being used for managing mobile phone |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105590347A (en) * | 2015-12-10 | 2016-05-18 | 广州点到网络科技有限公司 | Attendance system |
| CN106548529A (en) * | 2016-11-09 | 2017-03-29 | 杭州知加网络科技有限公司 | A kind of network student attendance statistical system |
| CN207473684U (en) * | 2017-09-27 | 2018-06-08 | 安徽亿联智能有限公司 | A kind of high practicability intelligent Checking on Work Attendance machine |
| CN208521332U (en) * | 2018-07-05 | 2019-02-19 | 南京信息工程大学 | It is a kind of using Mobile phone storage cabinet as the University classroom attendance checking system of carrier |
| CN109697764A (en) * | 2019-01-04 | 2019-04-30 | 山东科技大学 | A kind of intelligence Student Attendance System |
| CN209281482U (en) * | 2018-11-21 | 2019-08-20 | 恒鸿达科技有限公司 | A kind of attendance checking system |
| CN209516370U (en) * | 2019-04-11 | 2019-10-18 | 南京工程学院 | A kind of protection system of power system switch cabinet |
| CN110969714A (en) * | 2019-11-18 | 2020-04-07 | 湖北文理学院 | Deposit cell-phone attendance system based on i-shaped permanent magnet |
-
2020
- 2020-11-23 CN CN202011320534.4A patent/CN112435360A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105590347A (en) * | 2015-12-10 | 2016-05-18 | 广州点到网络科技有限公司 | Attendance system |
| CN106548529A (en) * | 2016-11-09 | 2017-03-29 | 杭州知加网络科技有限公司 | A kind of network student attendance statistical system |
| CN207473684U (en) * | 2017-09-27 | 2018-06-08 | 安徽亿联智能有限公司 | A kind of high practicability intelligent Checking on Work Attendance machine |
| CN208521332U (en) * | 2018-07-05 | 2019-02-19 | 南京信息工程大学 | It is a kind of using Mobile phone storage cabinet as the University classroom attendance checking system of carrier |
| CN209281482U (en) * | 2018-11-21 | 2019-08-20 | 恒鸿达科技有限公司 | A kind of attendance checking system |
| CN109697764A (en) * | 2019-01-04 | 2019-04-30 | 山东科技大学 | A kind of intelligence Student Attendance System |
| CN209516370U (en) * | 2019-04-11 | 2019-10-18 | 南京工程学院 | A kind of protection system of power system switch cabinet |
| CN110969714A (en) * | 2019-11-18 | 2020-04-07 | 湖北文理学院 | Deposit cell-phone attendance system based on i-shaped permanent magnet |
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Application publication date: 20210302 |