CN220047048U - Mahjong machine uncapping prevention signal device and mahjong machine - Google Patents
Mahjong machine uncapping prevention signal device and mahjong machine Download PDFInfo
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- CN220047048U CN220047048U CN202321025182.9U CN202321025182U CN220047048U CN 220047048 U CN220047048 U CN 220047048U CN 202321025182 U CN202321025182 U CN 202321025182U CN 220047048 U CN220047048 U CN 220047048U
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Abstract
The utility model discloses an anti-uncovering signal device of a mahjong machine, which comprises a signal transmitting device and a signal receiving device; the signal transmitting device is arranged in the mahjong machine, and the cover plate of the mahjong machine props against the signal transmitting device to enable the signal transmitting device to be in a standby state when the cover plate of the mahjong machine is closed; the cover plate of the mahjong machine is opened, the signal transmitting device transmits signals, and the signal receiving device receives the signals and sends out alarm information; the mahjong machine cover opening prevention signal device adopts a signal transmitting device to detect the opening and closing states of the mahjong machine cover plate, and when the mahjong machine cover plate is opened, alarm information is prompted through a signal receiving device, so that the problem that the mahjong machine cover plate is illegally opened and the control device is installed is solved.
Description
Technical Field
The utility model relates to the field of mahjong machines, in particular to an anti-uncovering signal device of a mahjong machine.
Background
Mahjong is popular as a recreation and entertainment tool, and along with the development of technology, an electric mahjong machine is widely used. At present, some cheating program control devices are arranged on the market, and the cheating program control devices can control the mahjong machine. The program control equipment for cheating needs to be additionally arranged in a normal mahjong machine, and the program control equipment for cheating needs to be additionally arranged in the mahjong machine by opening a cover plate of the mahjong machine. In an unsupervised or unsupervised environment, the mahjong machine may be easily opened without any reason and provided with a cheating control device, resulting in the mahjong machine being controlled by others.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a monitoring device for the state of an opening cover plate of a mahjong machine.
The utility model adopts the following technical scheme: an anti-uncovering signal device of a mahjong machine comprises a signal transmitting device and a signal receiving device;
the signal transmitting device is arranged in the mahjong machine, and the cover plate of the mahjong machine props against the signal transmitting device to enable the signal transmitting device to be in a standby state when the cover plate of the mahjong machine is closed; the cover plate of the mahjong machine is opened, the signal transmitting device transmits signals, and the signal receiving device receives the signals and sends out alarm information.
The specific alarm information can be a prompt tone, a signal lamp or characters.
Further, the signal transmitting device comprises a bottom shell, a trigger connecting rod, a spring, a switch and a signal transmitter;
the inside of the bottom shell is provided with a tunnel hole for setting a trigger connecting rod, the trigger connecting rod can move along the axial direction of the tunnel hole, and the trigger connecting rod can extend out of the bottom shell;
the mahjong machine cover plate is in contact with the trigger connecting rod and compresses the spring, the trigger connecting rod acts with the switch, and the switch is closed; the mahjong machine cover plate is opened, the spring pushes the trigger connecting rod to be far away from the switch, the switch is opened, the signal transmitter transmits a cover plate state signal, and the signal receiving device receives the cover plate state signal and sends alarm information.
The signal receiving device can be arranged on the mahjong machine; the signal receiving device can also be a separate component independent of the mahjong machine, and the signal transmitting device and the signal receiving device communicate in a wireless mode.
The switch may be of the contact type or the photoelectric type.
Further, the bottom shell is arranged on the upright post of the mahjong machine support cover plate, and the bottom shell is arranged on the upright post far away from the connecting hinge of the cover plate and the mahjong machine body.
Further, the signal receiving device comprises a shell, a signal receiver and an alarm, wherein the signal receiver is arranged in the shell, the alarm is arranged in the shell, and the signal receiver is electrically connected with the alarm; the signal transmitter communicates with the signal receiver by radio.
The signal receiving device can be arranged inside the mahjong machine; the signal receiving means may also be a component independent of the mahjong machine.
Further, the signal receiving device also comprises a display, the display is arranged in the shell, the display content is visible outside the shell, and the display is electrically connected with the signal receiver; the signal transmitter also comprises an ID information module, the ID information module sends ID coding information to the signal receiver through the signal transmitter, and the ID coding information is displayed on the display.
Further, the signal transmitting device further comprises a battery box for mounting a battery, and the battery box is electrically connected with the signal transmitter.
Further, the signal transmitter further comprises an electric quantity detection module; the signal receiving device further comprises an alarm signal lamp and an electric quantity early warning signal lamp, the alarm signal lamp is electrically connected with the signal receiver, the electric quantity early warning signal lamp is electrically connected with the signal receiver, and the alarm signal lamp, the electric quantity early warning signal lamp and the display are arranged on the same side of the shell, so that the display, the alarm signal lamp and the electric quantity early warning signal lamp can be observed on the same side.
A mahjong machine is provided with the cover-opening prevention signal device of the mahjong machine.
The utility model has the beneficial effects that: the utility model provides an anti-uncovering signal device of a mahjong machine, which adopts a signal transmitting device to detect the opening and closing states of a cover plate of the mahjong machine, and when the cover plate of the mahjong machine is opened, alarm information is prompted through a signal receiving device, so that the problem that the cover plate of the mahjong machine is illegally opened and a control device is installed is solved.
Furthermore, the signal transmitting device adopts a mechanical mode to detect the state of the cover plate, and has simple structure and high reliability.
Further, the bottom shell is arranged on the upright post far away from the hinge of the mahjong machine connected with the cover plate, and alarm information can be ensured to be sent when the opening angle of the cover plate is smaller.
Further, the signal transmitter and the signal receiver are in wireless communication, and the signal receiving device can be separated from the mahjong machine, so that the mahjong machine can be managed at a position far away from the mahjong machine, and the state that the cover plate is opened can be known in time through the signal receiving device.
Further, the display displays the ID codes of the mahjong machine transmitting devices, and one signal receiving device can be used for communicating with a plurality of signal transmitting devices, so that a mahjong machine manager can conveniently use one signal receiving device to manage a plurality of mahjong machines simultaneously.
Furthermore, the essence of the battery box can adopt a battery to supply power to the signal transmitting device, so that the structure of the signal transmitting device is simplified.
Furthermore, the alarm signal lamp adopts a redundant design mode, so that the problem that the cover plate opening information of the mahjong machine is missed due to the failure of the alarm is avoided, and the alarm information of the cover plate opening can be prompted in more modes; meanwhile, the electric quantity early-warning signal lamp can prompt that the electric quantity of the battery is too low, so that an administrator of the mahjong machine is reminded to replace a power supply battery of the signal transmitting device, and effective operation of the anti-uncovering signal device of the mahjong machine is ensured.
The mahjong machine comprises an anti-uncovering signal device of the mahjong machine, which can effectively detect and prompt the opening state of a cover plate of the mahjong machine, and prevent a person from cheating under the condition of unknowing.
Drawings
FIG. 1 is a schematic diagram of a signal transmitting device in an anti-uncovering signal device of a mahjong machine;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is an enlarged schematic view of the cover plate B of FIG. 2;
FIG. 4 is a schematic diagram of a signal receiving device in the anti-uncovering signal device of the mahjong machine;
fig. 5 is a block diagram of the circuit structure of the cover opening prevention signal device of the mahjong machine.
Detailed Description
Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 to 5 are schematic structural views of an embodiment of an anti-uncovering signal device for a mahjong machine according to the present utility model. As shown in fig. 1 to 5, the present utility model includes a signal transmitting device 1 and a signal receiving device 2; the signal transmitting device 1 is arranged in the mahjong machine, and when the cover plate 3 of the mahjong machine is in a closed state, the cover plate 3 of the mahjong machine props against the signal transmitting device 1 to enable the signal transmitting device 1 to be in a standby state; the cover plate 3 of the mahjong machine is opened, the signal transmitting device 1 transmits signals, and the signal receiving device 2 receives the signals and sends out alarm information.
When the mahjong machine cover plate 3 is opened, the signal transmitting device 1 transmits signals, and the signal receiving device 2 receives the signals of the signal transmitting device 1 and then sends out alarm information, so that the state of the mahjong machine cover plate 3 is monitored.
As shown in fig. 3, the signal transmitting device 1 includes a bottom shell 11, a trigger connecting rod 12, a spring 13, a switch 14 and a signal transmitter 15; the inside of the bottom shell 11 is provided with a tunnel hole for arranging the trigger connecting rod 12, the trigger connecting rod 12 can move along the axial direction of the tunnel hole, and the trigger connecting rod 12 can extend out of the bottom shell 11;
the switch 14 is arranged in the bottom shell 11, the switch 14 is electrically connected with the signal emitter 15, the spring 13 is arranged between the bottom shell 11 and the trigger connecting rod 12, the spring respectively abuts against the bottom shell 11 and the trigger connecting rod 12, the mahjong machine cover plate 3 is closed, the mahjong machine cover plate 3 abuts against the trigger connecting rod 12 and compresses the spring 13, the trigger connecting rod 12 acts with the switch 14, and the switch 14 is closed; the mahjong machine cover 3 is opened, the spring 13 pushes the trigger connecting rod 12 to be far away from the switch 14, the switch 14 is opened, the signal transmitter 15 transmits a cover plate state signal, and the signal receiving device 2 receives the cover plate state signal and sends out alarm information.
When the embodiment is used, the tunnel hole on the bottom shell 11 is axially arranged along the vertical direction, and the trigger connecting rod 12 can move along the vertical direction. The trigger connecting rod 12 is cross along the axle center longitudinal section, the trigger connecting rod 12 is a revolution body, the rod shape of the vertical direction of the trigger connecting rod 12 corresponds to the tunnel hole, the trigger connecting rod can move along the tunnel hole, and a boss in the middle of the trigger connecting rod 12 plays a limiting role. The lower end surface of the middle boss of the trigger connecting rod 12 is used for abutting against the spring 13, so that the spring 13 applies upward force to the trigger connecting rod 12. When the mahjong machine cover plate 3 is opened, the upper end face of the boss in the middle of the trigger connecting rod 12 is contacted with the bottom shell 11, so that the trigger connecting rod 12 is limited, and the trigger connecting rod 12 is prevented from flying out of the bottom shell 11. Correspondingly, the middle part of the tunnel hole is provided with a space capable of accommodating the boss at the middle part of the trigger connecting rod 12. The concrete tunnel hole comprises two sections of holes corresponding to the columns at the upper end and the lower end of the trigger connecting rod 12 respectively, the spring 13 is a spiral spring, the spring 13 is sleeved on the column-shaped appearance at the lower end of the trigger connecting rod 12, one end of the spring 13 is abutted against the lower end of the boss at the middle part of the trigger connecting rod 12, and one end of the spring 13 is abutted against the end face of the space containing the boss at the middle part of the trigger connecting rod 12 at the middle part of the tunnel hole. The triggering connecting rod 12 is used as a component for monitoring the state of the cover plate 3 of the mahjong machine; when the cover plate 3 of the mahjong machine is closed, the lower plane of the cover plate 3 is abutted against the upper end of the trigger connecting rod 12, the trigger connecting rod 12 is moved downwards to the action of the switch 14, so that the switch is closed, the signal emitter 15 does not work, and the spring 13 is compressed to store elastic potential energy; when the cover plate 3 of the mahjong machine is opened, the upper end of the trigger connecting rod 12 is not restricted any more, the trigger connecting rod 12 moves upwards to leave the switch 14 under the action of elastic potential energy of the spring 13, the trigger connecting rod 12 releases the switch 14, the switch 14 sends a switch signal to the signal transmitter 15, and the signal transmitter 15 sends a cover plate state signal that the cover plate 3 is opened to the signal receiving device 2 after receiving the switch signal.
As a specific way of realisation, the bottom shell 11 is arranged on the upright 4 of the mahjong machine support cover 3, and the bottom shell 11 is arranged on the upright 4 away from the hinge connecting the cover 3 with the mahjong machine body.
When the cover plate 3 is closed in use, the cover plate 3 is supported by the four stand columns 4 in the mahjong machine body, and the upper end surfaces of the stand columns 4 are the positions of the cover plate 3 when the cover plate is closed. When the bottom shell 11 is arranged on the upright post 4 far away from the hinge of the cover plate 3, the upper end surface of the upright post 4 can be used as a reference plane and a positioning plane for the installation of the upper end surface of the trigger connecting rod 12, so that the installation is convenient. The mahjong machine cover plate 3 is connected with the mahjong machine body through the hinge, at the moment, the mahjong machine cover plate 3 is in a lever structure, the hinge connected with the mahjong machine body by the cover plate 3 is used as a fulcrum, when the cover plate 3 is opened, the cover plate 3 rotates around the hinge, and the distance of the cover plate 3 moving away from the position of the hinge is further. The bottom shell 11 is arranged at one end far away from the connecting hinge of the cover plate 3, so that when the cover plate 3 is opened with a gap, the trigger connecting rod 12 has enough space for upward movement, the trigger connecting rod 12 moves upward to release the switch, and the reliability of the switch 14 for sending out a switch signal is ensured.
As a specific embodiment, as shown in fig. 4, the signal receiving apparatus 2 includes a housing 21, a signal receiver 22, and an alarm 23, the signal receiver 22 is disposed in the housing 21, the alarm 23 is disposed in the housing 21, and the signal receiver 22 is electrically connected to the alarm 23; the signal transmitter 15 communicates with the signal receiver 22 by means of radio signals.
In use of this embodiment, the signal receiving apparatus 2 is a component independent of the body of the mahjong machine. The signal receiver 22 in the signal receiving apparatus 2 communicates with the signal transmitter 15 by means of radio signals. As a specific way of realisation, the radio signal may take the 433MHz band. After the signal receiver 22 receives the cover plate state signal sent by the signal transmitter 15, the signal receiver 22 sends a signal to the alarm 23, and the alarm 23 sends out alarm information. In a specific implementation, the alarm 15 may be a buzzer, and after the buzzer receives the electrical signal sent by the signal receiver 22, the buzzer sends out an alarm sound to prompt a mahjong machine manager that the cover plate 3 of the mahjong machine is opened.
As a specific embodiment, the signal receiving apparatus 2 further includes a display 24, where the display 24 is disposed in the housing 21, the display 24 displays content visible outside the housing 21, and the display 24 is electrically connected to the signal receiver 22; the signal transmitting device 1 further comprises an ID information module which sends ID encoded information via the signal transmitter 15 to the signal receiver 22, which ID encoded information is displayed on the display 24.
In use, the signal transmitter 15 includes an ID information module, and the cover status signal transmitted by the signal transmitter 15 preserves the ID information of the signal transmitter 15, through which the signal transmitter 15 that specifically transmits the cover status signal can be identified. The ID information of the signal transmitter 15 can be displayed by the display 24. In practice, the display 24 may be a display module with an LED display screen or a display module with a liquid crystal screen.
The signal emitter 15 is used for specializing the ID information of the cover opening prevention signal device of each mahjong machine through an ID information module, and radio signal communication between the signal emitter 15 and the signal receiver 22 is carried out through fixed frequency, for example, 433Mhz frequency is adopted. A signal receiving apparatus 2 can receive the signal output from the unspecific signal transmitting apparatus 1. When the signal output by the signal transmitting device 1 is received by the signal receiving device 2, the ID code of the signal transmitting device 1 is displayed on the display 24 of the signal receiving device 2, so that the signal receiving device 2 can receive the signal output by the signal transmitting device 1 within a certain distance range of the signal transmitting device 1, and a plurality of mahjong machines can be managed simultaneously by one signal receiving device 2.
As a specific embodiment, the signal transmitting device 1 further includes a battery case 16 for mounting a battery, and the battery case 16 is electrically connected to the signal transmitter 15.
In this embodiment, a battery is used to supply power to the signal transmitter 15, and the signal transmitter 15 uses an integrated circuit module, so that the signal transmitter 1 is miniaturized and power is reduced. The signal transmitter 15 outputs a signal only when the cover plate 3 is opened, further reducing the power of the signal transmitting device 1, and facilitating energy saving.
As a specific embodiment, the signal transmitter 15 further includes a power detection module; as shown in fig. 4, the signal receiving apparatus 2 further includes an alarm signal lamp 25 and an electric quantity early warning signal lamp 26, the alarm signal lamp 25 is electrically connected with the signal receiver 22, the electric quantity early warning signal lamp 26 is electrically connected with the signal receiver 22, the alarm signal lamp 25, the electric quantity early warning signal lamp 26 and the display 24 are disposed on the same side of the housing 21, and the display 24, the alarm signal lamp 25 and the electric quantity early warning signal lamp 26 can be observed on the same side.
In use of the present embodiment, when the cover 3 is opened, the signal transmitter 15 outputs a cover status signal, and the signal receiver 22 lights the warning signal lamp 25 after the signal receiver 22 receives the signal. The signal alarm lamp 25 and the alarm 23 are in redundant design, so that the mahjong machine cover plate 3 is prevented from being opened by non-administrative staff under the condition of unknowing due to the failure of the alarm 23 or the omission of alarm information of the alarm 23.
Because the signal transmitter 15 is powered by a battery, in order to avoid the adverse effect of stopping the operation of the signal transmitter 15 due to the battery exhaustion, the electric quantity detection module of the signal transmitter 15 can periodically detect the electric quantity condition of the battery, when the electric quantity of the battery is low, the signal transmitter 15 can output a low-electric quantity early-warning signal, and the signal receiving module lights the electric quantity early-warning signal lamp 26 after receiving the low-electric quantity early-warning signal.
Example 2
Fig. 1 to 5 are schematic structural views of an embodiment of the mahjong machine of the present utility model. As shown in fig. 1 to 3, the mahjong machine comprises a mahjong machine body and a cover plate 3, wherein the cover plate 3 is horizontally arranged on the mahjong machine body, the mahjong machine body is connected with the cover plate 3 in a hinged manner, and a signal transmitting device 1 is arranged inside the mahjong machine body. The signal transmitting device 1 comprises a bottom shell 11, a trigger connecting rod 12, a spring 13, a switch 14 and a signal transmitter 15; the inside of the bottom shell 11 is provided with a tunnel hole for arranging the trigger connecting rod 12, the trigger connecting rod 12 can move along the axial direction of the tunnel hole, and the trigger connecting rod 12 can extend out of the bottom shell 11; the switch 14 is arranged in the bottom shell 11, the switch 14 is electrically connected with the signal emitter 15, the spring 13 is arranged between the bottom shell 11 and the trigger connecting rod 12, the spring respectively abuts against the bottom shell 11 and the trigger connecting rod 12, the mahjong machine cover plate 3 is closed, the mahjong machine cover plate 3 abuts against the trigger connecting rod 12 and compresses the spring 13, the trigger connecting rod 12 acts with the switch 14, and the switch 14 is closed; the mahjong machine cover plate 3 is opened, the spring 13 pushes the trigger connecting rod 12 to be far away from the switch 14, the switch 14 is opened, the signal transmitter 15 transmits a cover plate state signal, and the signal receiving device 2 receives the cover plate state signal and sends out alarm information.
When the mahjong machine cover plate 3 is used, the cover plate 3 is opened to remove the limit of the cover plate 3 on the trigger connecting rod 12, the trigger connecting rod 12 is further triggered to trigger the switch 14 to output a switch signal to the signal transmitter 15, and the signal transmitter 15 is enabled to output a cover plate 3 state signal, so that the state of the mahjong machine cover plate 3 is monitored. Solves the problem that a non-manager opens the cover plate 3 of the mahjong machine to install and control the cheating software of the mahjong machine under the condition of unknowing.
The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (8)
1. The anti-uncovering signal device of the mahjong machine is characterized by comprising a signal transmitting device (1) and a signal receiving device (2);
the signal transmitting device (1) is arranged in the mahjong machine, and when the cover plate (3) of the mahjong machine is in a closed state, the cover plate (3) of the mahjong machine props against the signal transmitting device (1) to enable the signal transmitting device (1) to be in a standby state; the cover plate (3) of the mahjong machine is opened, the signal transmitting device (1) transmits signals, and the signal receiving device (2) receives the signals and sends out alarm information.
2. The mahjong machine cover opening prevention signal device according to claim 1, wherein the signal emitting device (1) comprises a bottom shell (11), a trigger connecting rod (12), a spring (13), a switch (14) and a signal emitter (15);
a tunnel hole for setting a trigger connecting rod (12) is formed in the bottom shell (11), the trigger connecting rod (12) can move along the axial direction of the tunnel hole, and the trigger connecting rod (12) can extend out of the bottom shell (11);
the mahjong machine comprises a bottom shell (11), a signal transmitter (15), a switch (14), a spring (13), a cover plate (3) of the mahjong machine, a trigger connecting rod (12) and a compression spring (13), wherein the switch (14) is arranged in the bottom shell (11), the switch (14) is electrically connected with the signal transmitter (15), the spring (13) is arranged between the bottom shell (11) and the trigger connecting rod (12), the spring respectively props against the bottom shell (11) and the trigger connecting rod (12), the cover plate (3) of the mahjong machine is closed, the cover plate (3) of the mahjong machine props against the trigger connecting rod (12) and compresses the spring (13), the trigger connecting rod (12) acts with the switch (14), and the switch (14) is closed; the cover plate (3) of the mahjong machine is opened, the spring (13) pushes the trigger connecting rod (12) to be far away from the switch (14), the switch (14) is opened, the signal transmitter (15) transmits a cover plate state signal, and the signal receiving device (2) receives the cover plate state signal and sends alarm information.
3. The mahjong machine cover opening prevention signal device according to claim 2, wherein the bottom shell (11) is arranged on a stand column (4) of the mahjong machine support cover plate (3), and the bottom shell (11) is arranged on the stand column (4) far away from a hinge for connecting the cover plate (3) with the mahjong machine body.
4. A mahjong machine cover prevention signal device according to claim 3, wherein the signal receiving device (2) comprises a shell (21), a signal receiver (22) and an alarm (23), the signal receiver (22) is arranged in the shell (21), the alarm (23) is arranged in the shell (21), and the signal receiver (22) is electrically connected with the alarm (23); the signal transmitter (15) communicates with the signal receiver (22) by means of radio signals.
5. The mahjong machine cover prevention signal device according to claim 4, wherein the signal receiving device (2) further comprises a display (24), the display (24) is arranged in the shell (21), the display (24) is visible outside the shell (21), and the display (24) is electrically connected with the signal receiver (22);
the signal transmitter (15) further comprises an ID information module which transmits ID encoded information to the signal receiver (22) via the signal transmitter (15), the ID encoded information being displayed on the display (24).
6. The mahjong machine cover opening prevention signal device according to claim 4 or 5, wherein the signal emitting device (1) further comprises a battery box (16) for mounting a battery, and the battery box (16) is electrically connected with the signal emitter (15).
7. The mahjong machine cover prevention signal device according to claim 6, wherein the signal emitter (15) further comprises an electric quantity detection module; the signal receiving device (2) further comprises an alarm signal lamp (25) and an electric quantity early-warning signal lamp (26), the alarm signal lamp (25) is electrically connected with the signal receiver (22), the electric quantity early-warning signal lamp (26) is electrically connected with the signal receiver (22), the alarm signal lamp (25), the electric quantity early-warning signal lamp (26) and the display (24) are arranged on the same side of the shell (21), and the display (24), the alarm signal lamp (25) and the electric quantity early-warning signal lamp (26) can be observed on the same side.
8. A mahjong machine, which is characterized by comprising the mahjong machine cover opening prevention signal device according to claim 1 or 2 or 3 or 4 or 5 or 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321025182.9U CN220047048U (en) | 2023-04-28 | 2023-04-28 | Mahjong machine uncapping prevention signal device and mahjong machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321025182.9U CN220047048U (en) | 2023-04-28 | 2023-04-28 | Mahjong machine uncapping prevention signal device and mahjong machine |
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| Publication Number | Publication Date |
|---|---|
| CN220047048U true CN220047048U (en) | 2023-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321025182.9U Active CN220047048U (en) | 2023-04-28 | 2023-04-28 | Mahjong machine uncapping prevention signal device and mahjong machine |
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| Country | Link |
|---|---|
| CN (1) | CN220047048U (en) |
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2023
- 2023-04-28 CN CN202321025182.9U patent/CN220047048U/en active Active
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