CN211604454U - English teaching device convenient to operation show - Google Patents

English teaching device convenient to operation show Download PDF

Info

Publication number
CN211604454U
CN211604454U CN202020446764.4U CN202020446764U CN211604454U CN 211604454 U CN211604454 U CN 211604454U CN 202020446764 U CN202020446764 U CN 202020446764U CN 211604454 U CN211604454 U CN 211604454U
Authority
CN
China
Prior art keywords
fixedly connected
teaching device
base
display board
english teaching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN202020446764.4U
Other languages
Chinese (zh)
Inventor
丁威
赵怡宁
郝友菖
杨雪芬
马俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian International University
Original Assignee
Xian International University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian International University filed Critical Xian International University
Priority to CN202020446764.4U priority Critical patent/CN211604454U/en
Application granted granted Critical
Publication of CN211604454U publication Critical patent/CN211604454U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The utility model discloses an english teaching device convenient to operation show, the on-line screen storage device comprises a base, two curb plates of inner base wall's last fixed surface are connected with, the left surface of curb plate and inner base wall's left and right sides face fixed connection with the diaphragm respectively, the upper surface of diaphragm passes through the lower fixed surface of telescopic link and first show board and is connected, the spout has been seted up to the right flank of curb plate. The utility model discloses in, through setting up pivot, gear, rack, bracing piece, slider, first show board and telescopic link, staff's reversal carousel for the carousel drives gear revolve through the pivot, makes the gear pass through the rack and drives the bracing piece downstream, makes the bracing piece pass through the connecting rod and drives the slider downstream in the spout, makes first show board downstream, makes the telescopic link shrink, makes the staff can go the height of adjusting the show board according to the height, has made things convenient for staff's teaching.

Description

一种便于操作展示的英语教学装置An English teaching device that is easy to operate and display

技术领域technical field

本实用新型涉及教学辅助装置技术领域,尤其涉及一种便于操作展示的英语教学装置。The utility model relates to the technical field of teaching auxiliary devices, in particular to an English teaching device which is convenient for operation and display.

背景技术Background technique

目前,工作人员在授课教学过程中,往往根据不同语言的需求进行大量的板书,通用的教学板多为固定式的板面,尤其是进行英语教学时,工作人员需要经常在黑板上书写英文单词,并做其它一些演示等,使用起来十分不方便。At present, in the course of teaching, the staff often do a lot of writing on the blackboard according to the needs of different languages. The general teaching boards are mostly fixed boards. Especially when teaching English, the staff often need to write English words on the blackboard. , and do some other demonstrations, etc., it is very inconvenient to use.

现有的教学装置无法折叠,教学装置在存放时占用空间较大,现有的教学装置固定,不便于移动,且现有的教学装置不能根据工作人员的高度去调节黑板的高度,使用麻烦,费时费力,增加了工作人员的教学负担。The existing teaching device cannot be folded, the teaching device occupies a large space during storage, the existing teaching device is fixed and inconvenient to move, and the existing teaching device cannot adjust the height of the blackboard according to the height of the staff, which is troublesome to use. It is time-consuming and labor-intensive, increasing the teaching burden of the staff.

实用新型内容Utility model content

本实用新型的目的在于:为了解决现有的教学装置无法折叠,不便于移动,不能调节高度的问题,而提出的一种便于操作展示的英语教学装置。The purpose of the utility model is to propose an English teaching device that is easy to operate and display in order to solve the problems that the existing teaching device cannot be folded, is inconvenient to move, and cannot be adjusted in height.

为了实现上述目的,本实用新型采用了如下技术方案:In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

一种便于操作展示的英语教学装置,包括底座,所述底座内壁的上表面固定连接有两个侧板,所述侧板的左侧面和底座内壁的左侧面分别与横板的左右两侧面固定连接,所述横板的上表面通过伸缩杆与第一展示板的下表面固定连接,所述侧板的右侧面开设有滑槽。An English teaching device that is easy to operate and display, including a base, the upper surface of the inner wall of the base is fixedly connected with two side plates, the left side of the side plate and the left side of the inner wall of the base are respectively connected with the left and right sides of the horizontal plate. The side surfaces are fixedly connected, the upper surface of the horizontal plate is fixedly connected to the lower surface of the first display panel through a telescopic rod, and a chute is provided on the right side of the side panel.

所述滑槽内滑动连接有滑块,所述滑块的右侧面通过连接杆与支撑杆的左侧面固定连接,所述支撑杆的顶端与第一展示板的下表面固定连接,所述支撑杆内壁的右侧面固定连接有齿条。A slider is slidably connected in the chute, the right side of the slider is fixedly connected with the left side of the support rod through the connecting rod, and the top end of the support rod is fixedly connected with the lower surface of the first display board, so the A rack is fixedly connected to the right side of the inner wall of the support rod.

所述齿条与齿轮相啮合,所述齿轮的正面固定连接有转轴,所述转轴的外表面套接有轴承,所述轴承卡接在底座的正面,所述转轴正面的一端固定连接有转盘。The rack is meshed with the gear, the front of the gear is fixedly connected with a rotating shaft, the outer surface of the rotating shaft is sleeved with a bearing, the bearing is clamped on the front of the base, and one end of the front of the rotating shaft is fixedly connected with a turntable .

作为上述技术方案的进一步描述:As a further description of the above technical solution:

所述第一展示板内设置有第二展示板,所述第二展示板的左右两侧面均开设有若干个螺纹孔,所述螺纹孔内螺纹连接有螺钉,所述螺钉设置在第一展示板内。The first display board is provided with a second display board, the left and right sides of the second display board are provided with a number of threaded holes, the threaded holes are threadedly connected with screws, and the screws are arranged on the first display board. inside the board.

作为上述技术方案的进一步描述:As a further description of the above technical solution:

所述转轴设置在通孔内,所述通孔开设在支撑杆的正面。The rotating shaft is arranged in a through hole, and the through hole is opened on the front surface of the support rod.

作为上述技术方案的进一步描述:As a further description of the above technical solution:

所述底座下表面的四角处均固定连接有滚轮,所述转盘的正面固定连接有摇把。The four corners of the lower surface of the base are fixedly connected with rollers, and the front of the turntable is fixedly connected with a crank handle.

作为上述技术方案的进一步描述:As a further description of the above technical solution:

所述底座的正面固定连接有话筒连接口和扬声器。The front side of the base is fixedly connected with a microphone connection port and a speaker.

作为上述技术方案的进一步描述:As a further description of the above technical solution:

所述底座的正面设置有两个收纳盒,所述螺钉的外表面设置有橡胶套。The front of the base is provided with two storage boxes, and the outer surface of the screw is provided with a rubber sleeve.

综上所述,由于采用了上述技术方案,本实用新型的有益效果是:To sum up, due to the adoption of the above-mentioned technical solutions, the beneficial effects of the present utility model are:

1、本实用新型中,通过设置转盘、转轴、齿轮、齿条、支撑杆、连接杆、滑块、滑槽、侧板、第一展示板、横板和伸缩杆,工作人员反转转盘,使得转盘通过转轴带动齿轮转动,使得齿轮通过齿条带动支撑杆向下运动,使得支撑杆通过连接杆带动滑块在滑槽内向下运动,使得第一展示板向下运动,使得伸缩杆收缩,使得工作人员可以根据身高去调节展示板的高度,方便了工作人员的教学。1. In this utility model, by setting the turntable, the rotating shaft, the gear, the rack, the support rod, the connecting rod, the slider, the chute, the side plate, the first display board, the horizontal board and the telescopic rod, the staff reverses the turntable, The turntable drives the gear to rotate through the rotating shaft, so that the gear drives the support rod to move downward through the rack, so that the support rod drives the slider to move down in the chute through the connecting rod, so that the first display board moves downward, so that the telescopic rod shrinks , so that the staff can adjust the height of the display board according to the height, which is convenient for the staff to teach.

2、本实用新型中,设置第一展示板、第二展示板、螺纹孔和螺钉,当工作人员需要收起教学装置时,工作人员旋转螺钉,使得螺钉从螺纹孔内旋出,工作人员向下压动第二展示板,使得第二展示板向下运动,使得第二展示板完全收入第一展示板内,工作人员旋紧螺钉,使得螺钉旋进螺纹孔,操作简单,降低了工作人员的工作强度。2. In the present invention, a first display board, a second display board, threaded holes and screws are provided. When the staff needs to put away the teaching device, the staff rotates the screws so that the screws are unscrewed from the threaded holes, and the staff turns to the threaded holes. The second display board is pressed down, so that the second display board moves downward, so that the second display board is completely received into the first display board, and the staff tightens the screws so that the screws are screwed into the threaded holes, which is easy to operate and reduces the number of staff. work intensity.

3、本实用新型中,通过设置滑块,使得滑块可对支撑杆进行限位,使得支撑杆在运动时不会发生晃动,使得支撑杆可以带动第一展示板平稳的上下运动,通过设置滚轮,使得工作人员可以较为轻松的移动教学装置。3. In the present invention, by setting the slider, the slider can limit the position of the support rod, so that the support rod will not shake when moving, so that the support rod can drive the first display board to move up and down smoothly. The rollers make it easier for the staff to move the teaching device.

附图说明Description of drawings

图1为本实用新型提出的一种便于操作展示的英语教学装置的正视的剖面结构示意图;1 is a schematic cross-sectional structure diagram of a frontal view of an English teaching device that is convenient for operation and display proposed by the present utility model;

图2为本实用新型提出的一种便于操作展示的英语教学装置的底座正视的结构示意图;2 is a schematic structural diagram of the front view of the base of an English teaching device that is easy to operate and display, proposed by the utility model;

图3为本实用新型提出的一种便于操作展示的英语教学装置的底座左视的剖面结构示意图3 is a cross-sectional structural schematic diagram of the left side of the base of an English teaching device for easy operation and display proposed by the present invention

图4为本实用新型提出的一种便于操作展示的英语教学装置的支撑杆正视的结构示意图。FIG. 4 is a schematic structural diagram of a front view of a support rod of an English teaching device that is easy to operate and display according to the present invention.

图例说明:illustration:

1、底座;2、侧板;3、滑槽;4、滑块;5、连接杆;6、支撑杆;7、齿轮; 8、转轴;9、通孔;10、轴承;11、转盘;12、横板;13、伸缩杆;14、第一展示板;15、第二展示板;16、螺纹孔;17、螺钉;18、齿条;19、话筒连接口; 20、扬声器;21、收纳盒;22、滚轮。1. Base; 2. Side plate; 3. Chute; 4. Slider; 5. Connecting rod; 6. Support rod; 7. Gear; 8. Shaft; 9. Through hole; 10. Bearing; 11. Turntable; 12, horizontal plate; 13, telescopic rod; 14, first display board; 15, second display board; 16, threaded hole; 17, screw; 18, rack; 19, microphone connection port; 20, speaker; 21, Storage box; 22. Rollers.

具体实施方式Detailed ways

下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

请参阅图1-4,本实用新型提供一种技术方案:一种便于操作展示的英语教学装置,包括底座1,底座1内壁的上表面固定连接有两个侧板2,侧板2的左侧面和底座1内壁的左侧面分别与横板12的左右两侧面固定连接,通过设置横板12,使得横板12可对伸缩杆13进行固定,横板12的上表面通过伸缩杆13 与第一展示板14的下表面固定连接,通过设置伸缩杆13,使得伸缩杆13可对第一展示板14进行限位,使得第一展示板14在运动时不会发生晃动,侧板2的右侧面开设有滑槽3。1-4, the present utility model provides a technical solution: an English teaching device that is easy to operate and display, comprising a base 1, and two side plates 2 are fixedly connected to the upper surface of the inner wall of the base 1, and the left side of the side plate 2 is The side surface and the left side of the inner wall of the base 1 are respectively fixedly connected to the left and right sides of the horizontal plate 12. By setting the horizontal plate 12, the horizontal plate 12 can fix the telescopic rod 13, and the upper surface of the horizontal plate 12 passes through the telescopic rod 13. It is fixedly connected with the lower surface of the first display board 14, and by setting the telescopic rod 13, the telescopic rod 13 can limit the position of the first display board 14, so that the first display board 14 will not shake when moving, and the side board 2 There is a chute 3 on the right side of the .

滑槽3内滑动连接有滑块4,通过设置滑块4,使得滑块4可对支撑杆6进行限位,使得支撑杆6在运动时不会发生晃动,使得支撑杆6可以带动第一展示板14平稳的上下运动,滑块4的右侧面通过连接杆5与支撑杆6的左侧面固定连接,支撑杆6的顶端与第一展示板14的下表面固定连接,支撑杆6内壁的右侧面固定连接有齿条18,通过设置齿条18,使得工作人员转动齿轮7,使得齿轮 7可通过齿条18带动支撑杆6运动。A slider 4 is slidably connected in the chute 3. By setting the slider 4, the slider 4 can limit the support rod 6, so that the support rod 6 will not shake during movement, so that the support rod 6 can drive the first The display board 14 moves up and down smoothly, the right side of the slider 4 is fixedly connected with the left side of the support rod 6 through the connecting rod 5, the top of the support rod 6 is fixedly connected with the lower surface of the first display board 14, and the support rod 6 A rack 18 is fixedly connected to the right side of the inner wall. By setting the rack 18 , the worker can rotate the gear 7 , so that the gear 7 can drive the support rod 6 to move through the rack 18 .

齿条18与齿轮7相啮合,齿轮7的正面固定连接有转轴8,转轴8的外表面套接有轴承10,轴承10卡接在底座1的正面,转轴8正面的一端固定连接有转盘11。The rack 18 is meshed with the gear 7, the front of the gear 7 is fixedly connected with the rotating shaft 8, the outer surface of the rotating shaft 8 is sleeved with a bearing 10, the bearing 10 is clamped on the front of the base 1, and one end of the front of the rotating shaft 8 is fixedly connected with a turntable 11 .

具体的,如图1所示,第一展示板14内设置有第二展示板15,第二展示板15的左右两侧面均开设有若干个螺纹孔16,螺纹孔16内螺纹连接有螺钉17,螺钉17设置在第一展示板14内,通过设置螺纹孔16,因螺纹孔16的数量设置为若干个,使得工作人员可以对第二展示板15进行多次调节。Specifically, as shown in FIG. 1 , the first display board 14 is provided with a second display board 15 , the left and right sides of the second display board 15 are provided with a number of threaded holes 16 , and the threaded holes 16 are threadedly connected with screws 17 , the screws 17 are arranged in the first display board 14, and the number of screw holes 16 is set to several by setting the threaded holes 16, so that the staff can adjust the second display board 15 multiple times.

具体的,如图4所示,转轴8设置在通孔9内,通孔9开设在支撑杆6的正面,通过设置通孔9,使得支撑杆6在运动时,转轴8可在通孔9内滑动。Specifically, as shown in FIG. 4 , the rotating shaft 8 is arranged in the through hole 9 , and the through hole 9 is opened on the front surface of the support rod 6 . By setting the through hole 9 , when the support rod 6 is moving, the rotating shaft 8 can be in the through hole 9 . Slide inside.

具体的,如图2所示,底座1下表面的四角处均固定连接有滚轮22,转盘 11的正面固定连接有摇把,通过设置滚轮22,使得工作人员可以较为轻松的移动教学装置,通过设置摇把,使得工作人员可以较为轻松转动转盘11。Specifically, as shown in FIG. 2, the four corners of the lower surface of the base 1 are fixedly connected with rollers 22, and the front of the turntable 11 is fixedly connected with a crank handle. By setting the rollers 22, the staff can easily move the teaching device. The crank handle is provided so that the staff can turn the turntable 11 relatively easily.

具体的,如图2所示,底座1的正面固定连接有话筒连接口19和扬声器20,通过设置话筒连接口19和扬声器20,使得其可以连接话筒,使得工作人员在使用话筒时,扬声器20可以增大工作人员的声音,方便工作人员的教学。Specifically, as shown in FIG. 2 , a microphone connection port 19 and a speaker 20 are fixedly connected to the front of the base 1. By setting the microphone connection port 19 and the speaker 20, the microphone connection port 19 and the speaker 20 are arranged so that the microphone can be connected, so that the speaker 20 can be connected to the speaker when the staff is using the microphone. The voice of the staff can be increased to facilitate the teaching of the staff.

具体的,如图2所示,底座1的正面设置有两个收纳盒21,螺钉17的外表面设置有橡胶套,通过设置收纳盒21,使得收纳盒21内可以放置一些教学用具,通过设置螺钉17,因螺钉17的外表面设置有橡胶套,使得手掌不会与螺钉17 直接接触,降低了螺钉17对手掌造成的伤害程度。Specifically, as shown in FIG. 2 , two storage boxes 21 are arranged on the front of the base 1, and rubber sleeves are arranged on the outer surfaces of the screws 17. By setting the storage boxes 21, some teaching tools can be placed in the storage boxes 21. As for the screw 17 , the outer surface of the screw 17 is provided with a rubber sleeve, so that the palm will not be in direct contact with the screw 17 , thereby reducing the degree of damage caused by the screw 17 to the palm.

工作原理:使用时,当工作人员需要收起教学装置时,工作人员握住摇把,反转转盘11,使得转盘11通过转轴8带动齿轮7转动,使得齿轮7通过齿条18 带动支撑杆6向下运动,使得支撑杆6通过连接杆5带动滑块4在滑槽3内向下运动,使得第一展示板14向下运动,使得伸缩杆13收缩,待第一展示板14的下表面与底座1的上表面接触时,工作人员松开摇把,然后工作人员旋转螺钉17,使得螺钉17从螺纹孔16内旋出,工作人员向下压动第二展示板15,使得第二展示板15向下运动,使得第二展示板15完全收入第一展示板14内,工作人员旋紧螺钉17,使得螺钉17旋进螺纹孔16。Working principle: When in use, when the staff needs to put away the teaching device, the staff holds the crank handle and reverses the turntable 11, so that the turntable 11 drives the gear 7 to rotate through the rotating shaft 8, so that the gear 7 drives the support rod 6 through the rack 18. Move downward, so that the support rod 6 drives the slider 4 to move downward in the chute 3 through the connecting rod 5, so that the first display board 14 moves downward, so that the telescopic rod 13 shrinks, and the lower surface of the first display board 14 is When the upper surface of the base 1 is in contact, the worker loosens the crank handle, and then the worker rotates the screw 17, so that the screw 17 is unscrewed from the threaded hole 16, and the worker presses the second display board 15 downward, so that the second display board 15 moves downward, so that the second display board 15 is completely received into the first display board 14 , and the worker tightens the screw 17 so that the screw 17 is screwed into the threaded hole 16 .

以上所述,仅为本实用新型较佳的具体实施方式,但本实用新型的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本实用新型揭露的技术范围内,根据本实用新型的技术方案及其实用新型构思加以等同替换或改变,都应涵盖在本实用新型的保护范围之内。The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (6)

1. The English teaching device convenient to operate and display comprises a base (1) and is characterized in that two side plates (2) are fixedly connected to the upper surface of the inner wall of the base (1), the left side surfaces of the side plates (2) and the left side surface of the inner wall of the base (1) are fixedly connected with the left side surface and the right side surface of a transverse plate (12) respectively, the upper surface of the transverse plate (12) is fixedly connected with the lower surface of a first display plate (14) through a telescopic rod (13), and a sliding groove (3) is formed in the right side surface of each side plate (2);
a sliding block (4) is connected in the sliding groove (3) in a sliding manner, the right side surface of the sliding block (4) is fixedly connected with the left side surface of a supporting rod (6) through a connecting rod (5), the top end of the supporting rod (6) is fixedly connected with the lower surface of a first display board (14), and the right side surface of the inner wall of the supporting rod (6) is fixedly connected with a rack (18);
rack (18) and gear (7) mesh mutually, the positive fixedly connected with pivot (8) of gear (7), bearing (10) have been cup jointed to the surface of pivot (8), bearing (10) joint is in the front of base (1), the positive one end fixedly connected with carousel (11) of pivot (8).
2. The English teaching device convenient to operate and display of claim 1, wherein a second display board (15) is arranged in the first display board (14), a plurality of threaded holes (16) are formed in the left side surface and the right side surface of the second display board (15), screws (17) are connected to the threaded holes (16) in an internal thread mode, and the screws (17) are arranged in the first display board (14).
3. English teaching device easy to operate and show according to claim 1, characterized in that the rotating shaft (8) is arranged in a through hole (9), and the through hole (9) is arranged on the front surface of the support rod (6).
4. The English teaching device convenient to operate and display is characterized in that rollers (22) are fixedly connected to four corners of the lower surface of the base (1), and a crank is fixedly connected to the front surface of the turntable (11).
5. English teaching device convenient to operate and show according to claim 1, characterized in that the front of the base (1) is fixedly connected with a microphone connecting port (19) and a loudspeaker (20).
6. English teaching device convenient to operation show according to claim 2, characterized in that, the front of base (1) is provided with two receivers (21), the surface of screw (17) is provided with the rubber sleeve.
CN202020446764.4U 2020-03-31 2020-03-31 English teaching device convenient to operation show Expired - Fee Related CN211604454U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020446764.4U CN211604454U (en) 2020-03-31 2020-03-31 English teaching device convenient to operation show

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020446764.4U CN211604454U (en) 2020-03-31 2020-03-31 English teaching device convenient to operation show

Publications (1)

Publication Number Publication Date
CN211604454U true CN211604454U (en) 2020-09-29

Family

ID=72583096

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020446764.4U Expired - Fee Related CN211604454U (en) 2020-03-31 2020-03-31 English teaching device convenient to operation show

Country Status (1)

Country Link
CN (1) CN211604454U (en)

Similar Documents

Publication Publication Date Title
CN206082609U (en) Novel experiment desk
CN212389964U (en) Make things convenient for portable multimedia projection device of projection angle modulation
CN211604454U (en) English teaching device convenient to operation show
CN208126274U (en) A kind of computer host box with adjusting height function
CN110751881A (en) Adjustable combined type movable teaching board convenient to operate and demonstrate
CN206383713U (en) A kind of English teaching board
CN210836606U (en) Computer information management teaching device
CN210091485U (en) Multimode english teaching device of english teaching
CN207084559U (en) Environment art design teaching demonstration device
CN206353382U (en) A kind of multi-functional computer based multimedia teaching instrument
CN206021607U (en) The exhibiting device that a kind of Teaching of Economics is used
CN215382223U (en) Junior middle school student uses novel fine arts drawing board support frame
CN210896158U (en) A display stand for physics teaching
CN211237291U (en) A kind of art painting display board
CN209931872U (en) Foldable drawing frame for art design
CN210319169U (en) Replaceable projection device
CN209376024U (en) Flexible liquid crystal display FPC lamination structure
CN207458460U (en) A kind of human resource information showing stand
CN206025604U (en) Easy operation's electronic commerce teaching podium
CN207558232U (en) A kind of think of political affairs classroom instruction appurtenance
CN211479502U (en) Teaching device for mechanical principle
CN221766197U (en) Dull and stereotyped all-in-one of teaching memory
CN216849090U (en) An architectural model device with dust-proof function
CN210073053U (en) An English writing practice device
CN206141207U (en) Telescopic drawing board of inclination adjustable

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200929