CN112172383A - Multifunctional teaching device - Google Patents
Multifunctional teaching device Download PDFInfo
- Publication number
- CN112172383A CN112172383A CN202011219052.XA CN202011219052A CN112172383A CN 112172383 A CN112172383 A CN 112172383A CN 202011219052 A CN202011219052 A CN 202011219052A CN 112172383 A CN112172383 A CN 112172383A
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- sliding
- hydraulic cylinder
- board
- rod
- teaching device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B97/00—Furniture or accessories for furniture, not provided for in other groups of this subclass
- A47B97/04—Easels or stands for blackboards or the like
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- Drawing Aids And Blackboards (AREA)
Abstract
The invention relates to the technical field of teaching tools, in particular to a multifunctional teaching device, which comprises a bottom frame, a motor, a hydraulic cylinder and a display board, wherein the hydraulic cylinder drives the hydraulic rod to move up and down in a telescopic way, the bottom end of the hydraulic rod is fixed, the hydraulic cylinder is reversely driven by the hydraulic rod to drive the hydraulic cylinder to move up and down, the hydraulic cylinder drives a connecting plate, the connecting plate drives a sliding block, the sliding block slides up and down on the sliding rod, the sliding block drives a power arm through sliding on the sliding rod, the force arm drives an installation rod, the display board is driven to move up and down, the writing work of a teacher can be facilitated, the problem that the topmost writing end of the teacher writing board needs to stand up and the bottommost writing end needs to squat down is solved, the working efficiency is improved, and meanwhile, so that the height can be adjusted to achieve better display effect.
Description
Technical Field
The invention relates to the technical field of teaching aids, in particular to a multifunctional teaching device.
Background
In the teaching process, the teacher needs to board out relevant knowledge points and problems so that students can watch learning thinking, and at present, a teaching device is usually adopted to help the teacher to realize the board out.
However, current teaching device has very big problem in the use, current teaching device is when carrying out the clipboard, the device's surface is not smooth enough, produce the reflection of light easily, be unfavorable for the student to watch, current teaching device can't rotate, be unfavorable for the interchange interaction between teachers and students, the teaching effect has been reduced, can't be the show to the student of great visual angle scope, current teaching device can't adjust from top to bottom, it is not nimble enough to use, the teacher is writing the in-process, there is the teacher to write on the clipboard book the top need stand on tiptoe and write the problem that need squat in the bottom.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a multifunctional teaching device.
The technical scheme adopted by the invention for solving the technical problems is as follows: a multifunctional teaching device comprises an underframe, a motor, a hydraulic cylinder and a display board, wherein the underframe is of a frame structure, a bottom plate is welded at the center of the top of the underframe, the underframe and the bottom plate are both horizontally arranged, a plurality of supporting legs are mounted at the bottom end of the bottom plate, and the motor is fixedly mounted at the top of the bottom plate;
the display board is characterized in that the motor is vertically arranged, a rotating shaft is arranged in the center of the top end of the motor, a rotating platform is fixedly connected to the top end of the rotating shaft, the cross section of the rotating platform is of a circular structure, a sliding rod and a hydraulic cylinder are respectively arranged at the top of the rotating platform, the rotating shaft is driven to rotate by the motor, the rotating platform is driven to rotate by the rotating shaft, the rotating platform drives the display board to rotate, and the display board is rotated, so that the writing boards can be conveniently output from the display board from a plurality;
the hydraulic cylinder is vertically arranged, a hydraulic rod is arranged at the bottom end of the hydraulic cylinder, the hydraulic cylinder is connected with the top end of the rotary table through the hydraulic rod, a connecting plate is obliquely arranged at the top end of the hydraulic cylinder, one end of the connecting plate is connected with one side of the sliding block through a bolt, one side, close to the connecting plate, of the sliding block is provided with a force arm through a bolt, an installation rod is arranged at the other end of the force arm, a plurality of installation blocks are arranged on one side of the installation rod, a display plate is arranged on one side of each installation block, a first sliding groove is formed in one side, away from the connecting plate, of the sliding block, the sliding block is in sliding fit with the sliding rod through the first sliding groove, the hydraulic rod is driven by the hydraulic cylinder to move up and down in a telescopic mode, the hydraulic rod is fixed at, the sliding block slides on the sliding rod to drive the power arm, so that the force arm drives the mounting rod to drive the display board to move up and down, and the display board can move up and down to bring convenience to the writing work of teachers;
the utility model discloses a teaching device, including a demonstration board, installation piece, the bottom inner wall of recess and bottom inner wall all are equipped with the draw runner, the recess is equipped with moves the board, the second spout has all been seted up at the upper and lower both ends of moving the board, second spout and draw runner looks adaptation, move the board and pass through second spout sliding fit on the draw runner, through using this multi-functional teaching device, can write the board and go out to make the device play the effect of blackboard, through will moving the board and slide on the draw runner, thereby drive the facility for writing, also make things convenient for the student to watch simultaneously.
Specifically, the bottom welding of chassis has a plurality of otic placode, and the otic placode top has been seted up there is the screw, and the supporting legs is through installing the bottom at the chassis with screw thread fit.
Specifically, the slide bar is vertical setting, and the slide bar cross section is "worker" style of calligraphy structure, first spout and slide bar looks adaptation.
Specifically, the joint of the force arm and the sliding block is positioned above the joint of the connecting plate and the sliding block, and the force arm is obliquely arranged.
Specifically, the installation pole is vertical setting, and installation piece welded fastening is equipped with a plurality of screw in one side of installation pole, one side of installation piece.
The utility model discloses a novel material composite sheet, including the recess, the inboard wall of recess is for scribbling the alloy steel sheet with wear-resisting coating, can wear-resisting more, and does not fade, moves the board and be novel material composite sheet, is by import polymer alloy granule and epoxy through once only compression moulding, can make the surface that moves the board level and smooth more, has avoided the reflection of light.
The invention has the beneficial effects that:
(1) according to the multifunctional teaching device, the rotating shaft is driven by the motor to rotate, the rotating table is driven by the rotating shaft to rotate, the display board is driven by the rotating table to rotate, writing boards can be conveniently output from the display board from multiple angles by rotating the display board, multiple people can write on the display board cooperatively, convenience is provided for communication interaction between teachers and students in the using process, the teaching effect of the multifunctional teaching device can be effectively improved, meanwhile, contents can be displayed to the student display boards in multiple directions by rotating the display board, and the application range of the multifunctional teaching device is improved.
(2) The multifunctional teaching device of the invention is driven by the hydraulic cylinder to enable the hydraulic rod to move up and down in a telescopic way, by fixing the bottom end of the hydraulic rod, the hydraulic rod reversely drives the hydraulic cylinder to enable the hydraulic cylinder to move up and down, the hydraulic cylinder drives the connecting plate, the connecting plate drives the sliding block to enable the sliding block to slide up and down on the sliding rod, the sliding block slides on the sliding rod, thereby driving the power arm to drive the force arm to drive the mounting rod so as to drive the display board to move up and down, bringing convenience for a teacher to write by moving the display board up and down, solving the problems that the teacher needs to stand on tiptoe at the topmost writing end and needs to squat at the bottommost writing end, thereby the efficiency of work has been improved, simultaneously, through the upper and lower height of adjusting the show board, the flexibility that this multi-functional teaching device used is increased to can height-adjusting so that play better bandwagon effect.
(3) According to the multifunctional teaching device, the writing board can be taken out, so that the device can play a role of a blackboard, the inner wall of the groove is made into the alloy steel plate coated with the wear-resistant coating, the alloy steel plate can be more wear-resistant and does not fade, the service life of the multifunctional teaching device can be prolonged, convenience can be brought to a teacher to write on the writing board, the teaching effect of the device is enhanced, the surface of the moving board can be more flat and smooth by using the novel material composite plate as the moving board, reflection of light is avoided, students sitting at each corner can see writing on the writing board clearly, the multifunctional teaching device is suitable for a larger classroom, the moving board slides on the slide bar, so that convenience is brought to writing, and the students can conveniently watch the writing board.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic view of the assembly of the slide bar and slide block of the present invention.
Fig. 3 is a schematic structural diagram of the hydraulic cylinder of the present invention.
FIG. 4 is a schematic view of a slider structure according to the present invention.
FIG. 5 is a schematic diagram of a moving plate structure according to the present invention.
In the figure: 1. a chassis; 2. a base plate; 3. supporting legs; 4. a motor; 5. a rotating shaft; 6. a turntable; 7. a slide bar; 8. a hydraulic cylinder; 801. a hydraulic lever; 802. a connecting plate; 9. a slider; 901. a first chute; 10. a force arm; 11. mounting a rod; 12. mounting blocks; 13. a display board; 14. a groove; 15. a slide bar; 16. moving the plate; 17. a second runner.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-5, the multifunctional teaching device comprises an underframe 1, a motor 4, a hydraulic cylinder 8 and a display board 13, wherein the underframe 1 is of a frame structure, a bottom plate 2 is welded at the center of the top of the underframe 1, the underframe 1 and the bottom plate 2 are both arranged horizontally, a plurality of supporting legs 3 are installed at the bottom end of the bottom plate 2, and the motor 4 is fixedly installed at the top of the bottom plate 2;
the motor 4 is vertically arranged, the center of the top end of the motor 4 is provided with the rotating shaft 5, the top end of the rotating shaft 5 is fixedly connected with the rotating table 6, the cross section of the rotating table 6 is of a circular structure, the top of the rotating table 6 is respectively provided with the sliding rod 7 and the hydraulic cylinder 8, the rotating shaft 5 is driven by the motor 4 to rotate, the rotating table 6 is driven by the rotating shaft 5 to rotate, the rotating table 6 drives the display board 13 to rotate, the display board 13 is rotated, so that writing on the display board 13 from multiple angles is facilitated, multi-person cooperation is facilitated, convenience is provided for interaction between teachers and students in the using process, the teaching effect of the multifunctional teaching device can be effectively improved, meanwhile, the display board 13 is rotated, contents can be displayed to students in multiple directions, and the application range of the multifunctional teaching device is improved;
the hydraulic cylinder 8 is vertically arranged, a hydraulic rod 801 is arranged at the bottom end of the hydraulic cylinder 8, the hydraulic cylinder 8 is connected with the top end of the rotary table 6 through the hydraulic rod 801, a connecting plate 802 is obliquely arranged at the top end of the hydraulic cylinder 8, one end of the connecting plate 802 is connected with one side of the slider 9 through a bolt, a force arm 10 is installed at one side, close to the connecting plate 802, of the slider 9 through a bolt, an installation rod 11 is arranged at the other end of the force arm 10, a plurality of installation blocks 12 are arranged at one side of the installation rod 11, a display plate 13 is arranged at one side of the installation blocks 12, a first sliding groove 901 is formed in one side, far away from the connecting plate 802, of the slider 9 is in sliding fit on the sliding rod 7 through the first sliding groove 901, the hydraulic cylinder 8 is driven to enable the hydraulic rod 801 to move up and down in, the connecting plate 802 drives the slider 9, the slider 9 slides up and down on the sliding rod 7, the slider 9 slides on the sliding rod 7, so that the power arm 10 is driven, the force arm 10 drives the mounting rod 11, the display board 13 is driven to move up and down, convenience can be brought to the teacher in writing work by moving the display board 13 up and down, the problem that the teacher needs to stand on the tiptoe at the topmost writing end and squat at the bottommost writing end is solved, so that the working efficiency is improved, meanwhile, the flexibility of the multifunctional teaching device is improved by adjusting the up-down height of the display board 13, and the height can be adjusted so as to achieve a better display effect;
the recess 14 of square structure is seted up to one side that the installation piece 12 was kept away from to show board 13, the bottom inner wall and the bottom inner wall of recess 14 all are equipped with draw runner 15, recess 14 is equipped with moves board 16, move the upper and lower both ends of board 16 and all seted up second spout 17, second spout 17 and 15 looks adaptations of draw runner, move board 16 through 17 sliding fit of second spout on draw runner 15, through using this multi-functional teaching device, can the clipboard go out, thereby make the device play the effect of blackboard, slide on draw runner 15 through moving board 16, thereby for writing drive the facility, also make things convenient for the student to watch simultaneously.
A plurality of ear plates are welded at the bottom end of the bottom frame 1, screw holes are formed in the tops of the ear plates, and the supporting legs 3 are installed at the bottom end of the bottom frame 1 in a threaded fit mode with the screw holes.
The slide bar 7 is vertically arranged, the cross section of the slide bar 7 is of an I-shaped structure, and the first sliding groove 901 is matched with the slide bar 7.
The joint of the force arm 10 and the sliding block 9 is positioned above the joint of the connecting plate 802 and the sliding block 9, and the force arm 10 is arranged in an inclined manner.
The inside wall of recess 14 is for scribbling the alloy steel sheet with wear-resistant coating, can be more wear-resisting, do not fade, write and feel, the writing is clear, thereby can prolong the life that this multiplex can the teaching device, also can bring the facility for teacher's clipboard goes out simultaneously, strengthen the device's teaching effect, it is novel material composite sheet to move board 16, be by imported polymer alloy granule and epoxy through disposable press forming, the surface that can make to move board 16 levels more smoothly, the reflection of light has been avoided, can make the student who sits in each corner also can see clearly the board writing, be applicable to great classroom.
When in use, a groove 14 with a square structure is firstly arranged on one side of the display board 13 far away from the installation block 12, the inner side wall of the groove 14 is an alloy steel plate coated with a wear-resistant coating, sliding strips 15 are respectively arranged on the bottom inner wall and the bottom inner wall of the groove 14, a moving board 16 is arranged on the groove 14, the moving board 16 is a novel material composite board, second sliding grooves 17 are respectively arranged at the upper end and the lower end of the moving board 16, the moving board 16 is in sliding fit on the sliding strips 15 through the second sliding grooves 17, the multifunctional teaching device can write a board out by using the multifunctional teaching device, so that the device plays a role of a blackboard, the inner wall of the groove 14 is arranged into the alloy steel plate coated with the wear-resistant coating, the alloy steel plate is more wear-resistant and not faded, the writing hand feeling is good, the handwriting is clear, the service life of the multifunctional teaching device can be prolonged, meanwhile, convenience can be brought for tea, by using the novel material composite board as the moving board 16, the surface of the moving board 16 can be smoother and smoother, reflection of light is avoided, students sitting at each corner can also see writing on the board, the novel material composite board is suitable for a larger classroom, convenience is brought to writing and viewing of students by sliding the moving board 16 on the slide bar 15, then the rotating shaft 5 is arranged at the center of the top end of the motor 4, the rotating table 6 is fixedly connected to the top end of the rotating shaft 5, the sliding rods 7 are respectively arranged at the top of the rotating table 6, the rotating shaft 5 is driven by the motor 4 to rotate, the rotating table 6 is driven by the rotating shaft 5 to rotate, the displaying board 13 is driven by the rotating table 6, the displaying board 13 is convenient to write on the displaying board 13 from a plurality of angles by rotating the displaying board 13, writing on board writing by cooperation of a plurality of people is facilitated, and convenience is provided for the communication interaction between teachers and students in the using process, therefore, the teaching effect of the multifunctional teaching device can be effectively improved, meanwhile, the contents can be displayed to students in multiple directions by rotating the display board 13, the application range of the multifunctional teaching device is improved, finally, the hydraulic rod 801 is arranged at the bottom end of the hydraulic cylinder 8, the hydraulic cylinder 8 is connected with the top end of the rotary table 6 through the hydraulic rod 801, the connecting plate 802 is obliquely arranged at the top end of the hydraulic cylinder 8, one end of the connecting plate 802 is connected with one side of the sliding block 9 through a bolt, the force arm 10 is arranged at one side of the sliding block 9 close to the connecting plate 802 through a bolt, the mounting rod 11 is arranged at the other end of the force arm 10, a plurality of mounting blocks 12 are arranged at one side of the mounting rod 11, the first chute 901 is arranged at one side of the sliding block 9 far away from the connecting plate 802, the sliding block 9 is matched on the sliding rod 7 through the first chute 901 in a sliding, through with hydraulic stem 801 bottom mounting, hydraulic stem 801 is reverse to drive pneumatic cylinder 8, make pneumatic cylinder 8 reciprocate, pneumatic cylinder 8 drives connecting plate 802, connecting plate 802 drives slider 9, make slider 9 slide from top to bottom at slide bar 7, slider 9 is through sliding on slide bar 7, thereby take power arm 10, make arm of force 10 drive installation pole 11, thereby drive show board 13 and reciprocate, reciprocate through making show board 13, can bring the facility for the teacher writes work, solved the teacher and write the blackboard writing topmost need stand on tiptoe and write the problem that the bottommost need squat down, thereby the efficiency of work has been improved, and simultaneously, through the upper and lower height of adjusting show board 13, increase the flexibility that this multi-functional teaching device used, thereby can height-adjusting so that better bandwagon effect is played.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a multi-functional teaching device, includes chassis (1), motor (4), pneumatic cylinder (8) and show board (13), its characterized in that: the chassis (1) is of a frame structure, a bottom plate (2) is welded at the center of the top of the chassis (1), the chassis (1) and the bottom plate (2) are both horizontally arranged, a plurality of supporting legs (3) are mounted at the bottom end of the bottom plate (2), and a motor (4) is fixedly mounted at the top of the bottom plate (2);
the motor (4) is vertically arranged, a rotating shaft (5) is arranged in the center of the top end of the motor (4), a rotary table (6) is fixedly connected to the top end of the rotating shaft (5), the cross section of the rotary table (6) is of a circular structure, and a sliding rod (7) and a hydraulic cylinder (8) are respectively arranged at the top of the rotary table (6);
the hydraulic cylinder (8) is vertically arranged, a hydraulic rod (801) is arranged at the bottom end of the hydraulic cylinder (8), the hydraulic cylinder (8) is connected with the top end of the rotary table (6) through a hydraulic rod (801), the top end of the hydraulic cylinder (8) is obliquely provided with a connecting plate (802), one end of the connecting plate (802) is connected with one side of the sliding block (9) through a bolt, one side of the sliding block (9) close to the connecting plate (802) is provided with a force arm (10) through a bolt, the other end of the force arm (10) is provided with an installation rod (11), one side of the installation rod (11) is provided with a plurality of installation blocks (12), a display board (13) is arranged on one side of the mounting block (12), a first sliding groove (901) is arranged on one side of the sliding block (9) far away from the connecting plate (802), the sliding block (9) is in sliding fit with the sliding rod (7) through a first sliding groove (901);
the display board is characterized in that one side, far away from the installation block (12), of the display board (13) is provided with a groove (14) of a square structure, the inner wall of the bottom of the groove (14) and the inner wall of the bottom of the groove (14) are provided with sliding strips (15), the groove (14) is provided with a moving board (16), the upper end and the lower end of the moving board (16) are provided with second sliding grooves (17), the second sliding grooves (17) are matched with the sliding strips (15), and the moving board (16) is in sliding fit with the sliding strips (15) through the second sliding grooves (17).
2. A multi-functional teaching device according to claim 1, wherein: the bottom welding of chassis (1) has a plurality of otic placode, and the otic placode top has been seted up there is the screw, and supporting legs (3) are through installing the bottom in chassis (1) with screw thread fit.
3. A multi-functional teaching device according to claim 1, wherein: the slide bar (7) is vertically arranged, the cross section of the slide bar (7) is of an I-shaped structure, and the first sliding groove (901) is matched with the slide bar (7).
4. A multi-functional teaching device according to claim 1, wherein: the joint of the force arm (10) and the sliding block (9) is positioned above the joint of the connecting plate (802) and the sliding block (9), and the force arm (10) is arranged in an inclined manner.
5. A multi-functional teaching device according to claim 1, wherein: installation pole (11) are vertical setting, and installation piece (12) welded fastening is equipped with a plurality of screw in one side of installation pole (11), installation piece (12).
6. A multi-functional teaching device according to claim 1, wherein: the inner side wall of the groove (14) is an alloy steel plate coated with a wear-resistant coating, and the moving plate (16) is a novel material composite plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219052.XA CN112172383A (en) | 2020-11-04 | 2020-11-04 | Multifunctional teaching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219052.XA CN112172383A (en) | 2020-11-04 | 2020-11-04 | Multifunctional teaching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112172383A true CN112172383A (en) | 2021-01-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011219052.XA Pending CN112172383A (en) | 2020-11-04 | 2020-11-04 | Multifunctional teaching device |
Country Status (1)
| Country | Link |
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| CN (1) | CN112172383A (en) |
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| CN204483546U (en) * | 2015-02-09 | 2015-07-22 | 孟玉学 | A kind of teaching swivel mount |
| KR101602573B1 (en) * | 2014-10-01 | 2016-03-10 | 박기원 | Stand Type Multi-surface Board |
| CN209199385U (en) * | 2018-07-18 | 2019-08-02 | 长江大学 | A kind of tow sides show the teaching display board of word content |
| CN110782745A (en) * | 2019-11-14 | 2020-02-11 | 王依格 | Special teaching frame of etiquette teaching |
| CN210295533U (en) * | 2019-06-28 | 2020-04-10 | 大连海洋大学 | Multi-functional chinese language teaching interactive show board |
| CN210777349U (en) * | 2019-09-27 | 2020-06-16 | 广州华商职业学院 | Teaching is with show board |
| CN211207668U (en) * | 2020-03-10 | 2020-08-07 | 湖南化工职业技术学院（湖南工业高级技工学校） | Multi-functional presentation device of management science teaching usefulness |
| CN211742282U (en) * | 2020-03-17 | 2020-10-23 | 湖南化工职业技术学院（湖南工业高级技工学校） | Financial management teaching presentation device |
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2020
- 2020-11-04 CN CN202011219052.XA patent/CN112172383A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101602573B1 (en) * | 2014-10-01 | 2016-03-10 | 박기원 | Stand Type Multi-surface Board |
| CN204483546U (en) * | 2015-02-09 | 2015-07-22 | 孟玉学 | A kind of teaching swivel mount |
| CN209199385U (en) * | 2018-07-18 | 2019-08-02 | 长江大学 | A kind of tow sides show the teaching display board of word content |
| CN210295533U (en) * | 2019-06-28 | 2020-04-10 | 大连海洋大学 | Multi-functional chinese language teaching interactive show board |
| CN210777349U (en) * | 2019-09-27 | 2020-06-16 | 广州华商职业学院 | Teaching is with show board |
| CN110782745A (en) * | 2019-11-14 | 2020-02-11 | 王依格 | Special teaching frame of etiquette teaching |
| CN211207668U (en) * | 2020-03-10 | 2020-08-07 | 湖南化工职业技术学院（湖南工业高级技工学校） | Multi-functional presentation device of management science teaching usefulness |
| CN211742282U (en) * | 2020-03-17 | 2020-10-23 | 湖南化工职业技术学院（湖南工业高级技工学校） | Financial management teaching presentation device |
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Application publication date: 20210105 |