CN113450625A - Rotatable demonstration board for teaching and use method thereof - Google Patents

Rotatable demonstration board for teaching and use method thereof Download PDF

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Publication number
CN113450625A
CN113450625A CN202110112877.XA CN202110112877A CN113450625A CN 113450625 A CN113450625 A CN 113450625A CN 202110112877 A CN202110112877 A CN 202110112877A CN 113450625 A CN113450625 A CN 113450625A
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CN
China
Prior art keywords
rod
demonstration board
fixed
pad
supporting
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.)
Pending
Application number
CN202110112877.XA
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Chinese (zh)
Inventor
沈香萍
巨同尧
谭吉香
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Weifang Engineering Vocational College
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Weifang Engineering Vocational College
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 Weifang Engineering Vocational College filed Critical Weifang Engineering Vocational College
Priority to CN202110112877.XA priority Critical patent/CN113450625A/en
Publication of CN113450625A publication Critical patent/CN113450625A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B19/00Teaching not covered by other main groups of this subclass

Abstract

The invention discloses a rotatable demonstration board for teaching and a using method thereof, and the rotatable demonstration board comprises a demonstration board main body, wherein the outer side of the demonstration board main body is connected with an installation frame, the outer side of the installation frame is fixedly provided with a fixing mechanism, the bottom of the installation frame is provided with a connecting rod, the bottom of the connecting rod is fixedly provided with a connecting frame, the outer side of the connecting frame is provided with a locking mechanism, the inside of the connecting frame is movably connected with a roller main body through an installation shaft, and the top of the connecting rod is provided with a supporting mechanism; the angle adjusting device is provided with the fixing mechanism, so that the angle of the demonstration board main body can be conveniently adjusted, and the adjusting operation is simple and convenient; the roller wheel locking mechanism is arranged, so that locking of the roller wheel main body can be conveniently released, the position where the demonstration board main body is placed can be conveniently adjusted, and the effect of easily moving and fixing the placed position is achieved; the support mechanism is arranged, so that the support rod can be conveniently installed, and the stability of the connecting structure is ensured.

Description

Rotatable demonstration board for teaching and use method thereof
Technical Field
The invention belongs to the technical field of teaching aids, and particularly relates to a rotatable demonstration board for teaching and a using method thereof.
Background
Teaching is a human-specific talent training activity consisting of teacher's teaching and student's learning. Through the activities, teachers purposefully, programmatically and organically guide students to learn and master cultural scientific knowledge and skills, and promote the improvement of students quality, so that the students become people required by the society, in the teaching process, a demonstration board is generally required to be used, and blackboard writing and the like are carried out through the demonstration board so that the students can learn.
Disclosure of Invention
The invention aims to provide a rotary demonstration board for teaching and a using method thereof, which can conveniently adjust the angle of a demonstration board main body, can conveniently remove the dead lock of a roller main body and can ensure the stability of a connecting structure.
In order to achieve the purpose, the invention provides the following technical scheme: a rotatable demonstration board for teaching and a using method thereof comprise a demonstration board main body, wherein the outer side of the demonstration board main body is connected with a mounting frame, the outer side of the mounting frame is fixedly provided with a fixing mechanism, the bottom of the mounting frame is provided with a connecting rod, the bottom of the connecting rod is fixedly provided with a connecting frame, the outer side of the connecting frame is provided with a locking mechanism, the inside of the connecting frame is movably connected with a roller main body through a mounting shaft, and the top of the connecting rod is provided with a supporting mechanism;
the fixed establishment includes the shell body, the interior diapire of shell body is fixed with connecting spring, connecting spring's top is connected with the adapter sleeve, the top of adapter sleeve is fixed with the locking pole, the bottom of adapter sleeve is fixed with the carriage release lever, the bottom of carriage release lever is provided with the handle board, one side inner wall connection of shell body has the supporting pad, the both sides of demonstration board main part all are fixed with the dead lever, the outside of adapter sleeve is fixed with the slider.
As a further scheme of the invention: the locking mechanism comprises a connecting block, a supporting spring is connected to the inner wall of one side of the connecting block, a limiting plate is fixed to one end of the supporting spring, a locking column is fixed to the other side of the limiting plate, the outer side of the limiting plate is connected with a limiting pad, a connecting column is connected to the outer side of the limiting plate, a handle pad is fixed to the other end of the connecting column, a limiting block is slidably connected to the inner portion of the connecting block, and a supporting block is connected to the outer side of the limiting block.
As a further scheme of the invention: the limiting wheel is arranged on the outer side of the limiting plate, and a limiting groove is formed in the connecting block.
As a further scheme of the invention: the supporting mechanism comprises a supporting rod, a mounting plate is fixed at the bottom of the supporting rod, a positioning rod is arranged at the bottom of the supporting rod, a magnet pad extending to the outer side is embedded into the supporting rod, a connecting pad is fixed on the outer side of the supporting rod, and a clamping block is connected to the outer side of the connecting pad.
As a further scheme of the invention: the mounting panel embedding is fixed the inside of connecting rod, the mounting panel with pass through the bolt fastening between the connecting rod.
As a further scheme of the invention: a clamping groove is formed in the fixed rod, and the size of the clamping groove is matched with that of the locking rod.
As a further scheme of the invention: the through hole for accommodating the moving rod to penetrate through is formed in the outer shell.
As a further scheme of the invention: the outer side of the handle plate is provided with anti-slip lines, and the handle plate and the moving rod are fixedly bonded.
As a further scheme of the invention: the specific operation steps are as follows:
the method comprises the following steps: inserting the mounting plate and the positioning rod at one end of the supporting rod into the connecting rod, clamping the connecting pad and the clamping block at the other end of the supporting rod into the mounting frame, and clamping one side of the magnet pad into the mounting frame;
step two: the handle pad is pulled, the connecting column and the limiting plate are driven to move together through the handle pad, the locking column on the other side of the limiting plate can be separated from the roller body at the moment, the supporting block is pushed in the vertical direction, the supporting block is clamped into a gap between the handle pad and the connecting block, and the mounting frame can be normally pushed to move at the moment;
step three: the supporting block is pushed upwards, the supporting spring can push the limiting plate and the locking column to move and drive the locking column on the outer side of the limiting plate to be clamped into the roller body, and the roller body is locked;
step four: the handle plate is pulled in the vertical direction, so that the handle plate drives the movable rod and the connecting sleeve to move, the locking rod at the top of the connecting sleeve is separated from the fixed rod, the demonstration plate body is stirred to rotate and adjust the angle, and the handle plate is loosened after adjustment is completed.
Compared with the prior art, the invention has the beneficial effects that:
(1) the demonstration board is provided with the fixing mechanism, so that the angle of the demonstration board main body can be conveniently adjusted, the adjustment operation is simple and convenient, the original condition of easy corrosion is avoided, and the use process is simple and convenient.
(2) The roller wheel locking mechanism is arranged, so that locking of the roller wheel main body can be conveniently released, the position where the demonstration board main body is placed can be conveniently adjusted, the roller wheel main body can be conveniently locked only by poking the supporting block in the vertical direction after the adjustment is completed, and the effect of easily moving and fixing the placing position is achieved.
(3) The support mechanism is arranged, so that the support rod can be conveniently installed, the support between the connecting rod and the installation frame can be enhanced by the support rod, and the stability of the connecting structure is ensured.
Drawings
FIG. 1 is a perspective view of the present invention in its entirety;
FIG. 2 is a cross-sectional view of the securing mechanism of the present invention;
FIG. 3 is a cross-sectional view of a fixation rod of the present invention;
FIG. 4 is a cross-sectional view of the locking mechanism of the present invention;
FIG. 5 is a cross-sectional view of the support mechanism of the present invention
In the figure: 1. a demonstration board main body; 2. a mounting frame; 3. a fixing mechanism; 31. an outer housing; 32. a connecting spring; 33. connecting sleeves; 34. a locking lever; 35. a travel bar; 36. a handle plate; 37. a support pad; 38. fixing the rod; 39. a slider; 4. a connecting rod; 5. a connecting frame; 6. a locking mechanism; 61. connecting blocks; 62. a support spring; 63. a limiting plate; 64. locking the column; 65. a limiting pad; 66. connecting columns; 67. a handle pad; 68. a limiting block; 69. a support block; 7. a roller body; 8. a support mechanism; 81. a support bar; 82. mounting a plate; 83. positioning a rod; 84. a magnet pad; 85. a connecting pad; 86. and (7) clamping blocks.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: a rotatable demonstration board for teaching and a using method thereof are disclosed, the rotatable demonstration board comprises a demonstration board main body 1, the outer side of the demonstration board main body 1 is connected with a mounting frame 2, the outer side of the mounting frame 2 is fixed with a fixing mechanism 3, the bottom of the mounting frame 2 is provided with a connecting rod 4, the bottom of the connecting rod 4 is fixed with a connecting frame 5, the outer side of the connecting frame 5 is provided with a locking mechanism 6, the inside of the connecting frame 5 is movably connected with a roller main body 7 through a mounting shaft, and the top of the connecting rod 4 is provided with a supporting mechanism 8;
the fixing mechanism 3 comprises an outer shell 31, a connecting spring 32 is fixed on the inner bottom wall of the outer shell 31, the top of the connecting spring 32 is connected with a connecting sleeve 33, a locking rod 34 is fixed on the top of the connecting sleeve 33, a moving rod 35 is fixed on the bottom of the connecting sleeve 33, a handle plate 36 is arranged on the bottom of the moving rod 35, a supporting pad 37 is connected on the inner wall of one side of the outer shell 31, fixing rods 38 are fixed on both sides of the demonstration board main body 1, a sliding block 39 is fixed on the outer side of the connecting sleeve 33, when the angle of the demonstration board main body 1 needs to be adjusted, the handle plate 36 only needs to be pulled in the vertical direction, the handle plate 36 can drive the moving rod 35 to move together, then the moving rod 35 can drive the connecting sleeve 33 and the locking rod 34 to move, the locking rod 34 can be separated from the inside of the fixing rod 38, the locking of the fixing rod 38 can be released, and the angle of the demonstration board main body 1 can be conveniently adjusted, the adjustment is simple and convenient, the original condition of easy corrosion is avoided, and the use process is simple and convenient.
As an embodiment of the present invention, the locking mechanism 6 includes a connecting block 61, a supporting spring 62 is connected to an inner wall of one side of the connecting block 61, a limiting plate 63 is fixed to one end of the supporting spring 62, a locking post 64 is fixed to the other side of the limiting plate 63, a limiting pad 65 is connected to an outer side of the limiting plate 63, a connecting post 66 is connected to an outer side of the limiting plate 63, a handle pad 67 is fixed to the other end of the connecting post 66, a limiting block 68 is slidably connected to an inner portion of the connecting block 61, a supporting block 69 is connected to an outer side of the limiting block 68, when the position of the demonstration board body 1 needs to be moved, the handle pad 67 is pulled horizontally, the handle pad 67 can pull the limiting plate 63 horizontally through the connecting post 66, and the locking post 64 on the other side of the limiting plate 63 can be disengaged from the inner portion of the roller body 7, and then the supporting block 69 is pulled vertically to make the supporting block 69 abut against the outer side of the handle pad 67, and can be convenient the release dead to the lock of gyro wheel main part 7 to the position that demonstration board main part 1 was placed is convenient for adjust, and only need vertical direction stir supporting shoe 69 after the readjustment is accomplished, can be convenient accomplish dead to the lock of gyro wheel main part 7, reached easily remove and fixed the effect of placing the position.
As an embodiment of the present invention, a limiting wheel is disposed outside the limiting plate 63, and a limiting groove is disposed inside the connecting block 61.
As an embodiment of the present invention, the supporting mechanism 8 includes a supporting rod 81, a mounting plate 82 is fixed at the bottom of the supporting rod 81, a positioning rod 83 is arranged at the bottom of the supporting rod 81, a magnet pad 84 extending to the outside is embedded in the supporting rod 81, a connecting pad 85 is fixed at the outside of the supporting rod 81, and a fixture block 86 is connected to the outside of the connecting pad 85, only the mounting plate 82 and the positioning rod 83 at one end of the supporting rod 81 are inserted into the connecting rod 4, and then the mounting plate 82 and the connecting rod 4 are fixedly connected by a bolt, at this time, the connecting pad 85 and the fixture block 86 at the other end of the supporting rod 81 can be clamped into the mounting bracket 2, and by the arrangement of the magnet pad 84, the connection can be ensured to be stable, the mounting of the supporting rod 81 can be conveniently completed, and the supporting rod 81 can strengthen the support between the connecting rod 4 and the mounting bracket 2, and ensure the connection structure to be stable.
In one embodiment of the present invention, the mounting plate 82 is fitted and fixed inside the connecting rod 4, and the mounting plate 82 and the connecting rod 4 are fixed by bolts.
In an embodiment of the present invention, a slot is formed inside the fixing rod 38, and the size of the slot is adapted to the size of the locking rod 34.
In one embodiment of the present invention, the outer housing 31 has a through hole formed therein for receiving the movable rod 35.
In one embodiment of the present invention, the grip plate 36 is provided with anti-slip threads on the outer side thereof, and the grip plate 36 and the travel bar 35 are fixed by adhesion.
As an embodiment of the invention, the specific operation steps are as follows:
the method comprises the following steps: the mounting plate 82 and the positioning rod 83 at one end of the supporting rod 81 are inserted into the connecting rod 4, the connecting pad 85 and the fixture block 86 at the other end of the supporting rod 81 are clamped into the mounting frame 2, and one side of the magnet pad 84 can be clamped into the mounting frame 2;
step two: the handle pad 67 is pulled, the connecting column 66 and the limiting plate 63 are driven to move together through the handle pad 67, at the moment, the locking column 64 on the other side of the limiting plate 63 can be separated from the roller body 7, the supporting block 69 is pushed in the vertical direction, the supporting block 69 is clamped in a gap between the handle pad 67 and the connecting block 61, and at the moment, the mounting frame 2 can be normally pushed to move;
step three: the supporting block 69 is pushed upwards, the supporting spring 62 can push the limiting plate 63 and the locking column 64 to move, and the locking column 64 on the outer side of the limiting plate 63 is driven to be clamped into the roller body 7, so that the roller body 7 is locked;
step four: the handle plate 36 is pulled in the vertical direction, so that the handle plate 36 drives the movable rod 35 and the connecting sleeve 33 to move, the locking rod 34 at the top of the connecting sleeve 33 is separated from the fixing rod 38, the demonstration board main body 1 is pulled to rotate and adjust the angle, and the handle plate 36 is loosened after the adjustment is completed.
The working principle of the invention is as follows: when the device is used and the angle of the demonstration board main body 1 needs to be adjusted, only the handle board 36 needs to be pulled in the vertical direction, the handle board 36 can drive the movable rod 35 to move together, then the movable rod 35 can drive the connecting sleeve 33 and the locking rod 34 to move, the locking rod 34 can be separated from the inside of the fixed rod 38, and the locking of the fixed rod 38 can be released, so that the angle of the demonstration board main body 1 can be conveniently adjusted, the adjustment operation is simple and convenient, the original condition of easy corrosion is avoided, and the use process is simple and convenient; when the position where the demonstration board main body 1 is placed needs to be moved, only the handle pad 67 needs to be pulled in the horizontal direction, the limiting plate 63 can be pulled in the horizontal direction through the connecting column 66 by the handle pad 67, the locking column 64 on the other side of the limiting plate 63 can be separated from the inside of the roller main body 7, then the supporting block 69 is shifted in the vertical direction, the supporting block 69 is abutted against the outer side of the handle pad 67, and the locking of the roller main body 7 can be conveniently released, so that the position where the demonstration board main body 1 is placed is convenient to adjust, and the supporting block 69 is shifted in the vertical direction after the readjustment is completed, the locking of the roller main body 7 can be conveniently completed, and the effects of easy movement and fixed placement position are achieved; only need insert connecting rod 4 with mounting panel 82 and the locating lever 83 of bracing piece 81 one end in, the rethread bolt is with mounting panel 82 and connecting rod 4 fixed connection, the connection pad 85 and the fixture block 86 of the bracing piece 81 other end all can block into in mounting bracket 2 this moment, and through the setting of magnet pad 84, can ensure to connect comparatively firmly, completion bracing piece 81's that can be convenient installation, and bracing piece 81 can strengthen the support between connecting rod 4 and the mounting bracket 2, ensure that connection structure is firm.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a teaching is with rotatable type demonstration board and application method thereof, includes demonstration board main part (1), its characterized in that: the demonstration board comprises a demonstration board main body (1), and is characterized in that an installation frame (2) is connected to the outer side of the demonstration board main body (1), a fixing mechanism (3) is fixed to the outer side of the installation frame (2), a connecting rod (4) is arranged at the bottom of the installation frame (2), a connecting frame (5) is fixed to the bottom of the connecting rod (4), a locking mechanism (6) is arranged on the outer side of the connecting frame (5), a roller main body (7) is movably connected to the inside of the connecting frame (5) through an installation shaft, and a supporting mechanism (8) is arranged at the top of the connecting rod (4);
fixing mechanism (3) are including shell body (31), the interior diapire of shell body (31) is fixed with connecting spring (32), the top of connecting spring (32) is connected with adapter sleeve (33), the top of adapter sleeve (33) is fixed with locking pole (34), the bottom of adapter sleeve (33) is fixed with carriage release lever (35), the bottom of carriage release lever (35) is provided with handle board (36), one side wall connection of shell body (31) has supporting pad (37), the both sides of demonstration board main part (1) all are fixed with dead lever (38), the outside of adapter sleeve (33) is fixed with slider (39).
2. A rotatable demonstration board for teaching and its use method according to claim 1, wherein: locking mechanism (6) including connecting block (61), one side inner wall connection of connecting block (61) has supporting spring (62), the one end of supporting spring (62) is fixed with limiting plate (63), the opposite side of limiting plate (63) is fixed with locking post (64), the outside of limiting plate (63) is connected with spacing pad (65), the outside of limiting plate (63) is connected with spliced pole (66), the other end of spliced pole (66) is fixed with handle pad (67), the inside sliding connection of connecting block (61) has stopper (68), the outside of stopper (68) is connected with supporting shoe (69).
3. A rotatable demonstration board for teaching and its use method according to claim 2, wherein: the outer side of the limiting plate (63) is provided with a limiting wheel, and a limiting groove is formed in the connecting block (61).
4. A rotatable demonstration board for teaching and its use method according to claim 1, wherein: supporting mechanism (8) include bracing piece (81), the bottom of bracing piece (81) is fixed with mounting panel (82), the bottom of bracing piece (81) is provided with locating lever (83), the inside embedding of bracing piece (81) has magnet pad (84) that extend to the outside, the outside of bracing piece (81) is fixed with connection pad (85), the outside of connection pad (85) is connected with fixture block (86).
5. A rotatable demonstration board for teaching and its use method according to claim 4, wherein: the mounting plate (82) is embedded and fixed in the connecting rod (4), and the mounting plate (82) is fixed with the connecting rod (4) through bolts.
6. A rotatable demonstration board for teaching and its use method according to claim 1, wherein: a clamping groove is formed in the fixing rod (38), and the size of the clamping groove is matched with that of the locking rod (34).
7. A rotatable demonstration board for teaching and its use method according to claim 1, wherein: the inner part of the outer shell (31) is provided with a through hole for accommodating the moving rod (35) to penetrate through.
8. A rotatable demonstration board for teaching and its use method according to claim 1, wherein: the outer side of the handle plate (36) is provided with anti-slip threads, and the handle plate (36) and the moving rod (35) are fixedly bonded.
9. A rotatable demonstration board for teaching and its use method according to claim 1, wherein: the specific operation steps are as follows:
the method comprises the following steps: inserting an installation plate (82) and a positioning rod (83) at one end of a supporting rod (81) into a connecting rod (4), clamping a connecting pad (85) and a clamping block (86) at the other end of the supporting rod (81) into an installation frame (2), and clamping one side of a magnet pad (84) into the installation frame (2) at the same time;
step two: the handle pad (67) is pulled, the connecting column (66) and the limiting plate (63) are driven to move together through the handle pad (67), at the moment, the locking column (64) on the other side of the limiting plate (63) can be separated from the roller body (7), the supporting block (69) is pushed in the vertical direction, the supporting block (69) is clamped in a gap between the handle pad (67) and the connecting block (61), and the mounting frame (2) can be normally pushed to move at the moment;
step three: the supporting block (69) is pushed upwards, the supporting spring (62) can push the limiting plate (63) and the locking column (64) to move, and the locking column (64) on the outer side of the limiting plate (63) is driven to be clamped into the roller body (7), so that the roller body (7) is locked;
step four: the handle plate (36) is pulled in the vertical direction, so that the handle plate (36) drives the movable rod (35) and the connecting sleeve (33) to move, the locking rod (34) at the top of the connecting sleeve (33) is separated from the fixed rod (38), the demonstration plate main body (1) is shifted to rotate and adjust the angle, and the handle plate (36) is loosened after the adjustment is completed.
CN202110112877.XA 2021-01-27 2021-01-27 Rotatable demonstration board for teaching and use method thereof Pending CN113450625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110112877.XA CN113450625A (en) 2021-01-27 2021-01-27 Rotatable demonstration board for teaching and use method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110112877.XA CN113450625A (en) 2021-01-27 2021-01-27 Rotatable demonstration board for teaching and use method thereof

Publications (1)

Publication Number Publication Date
CN113450625A true CN113450625A (en) 2021-09-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110112877.XA Pending CN113450625A (en) 2021-01-27 2021-01-27 Rotatable demonstration board for teaching and use method thereof

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110093258A (en) * 2010-02-12 2011-08-18 삼성전자주식회사 Apparatus and method for transmitting and receiving map data
CN211427507U (en) * 2020-04-14 2020-09-04 李瑞东 Display board for preschool education cognition
CN211764510U (en) * 2020-03-17 2020-10-27 昆明市官渡区职业高级中学 Multi-functional fine arts teaching blackboard
CN111840792A (en) * 2020-08-21 2020-10-30 杭州宸武科技有限公司 Physiotherapy equipment for dermatology
CN211843841U (en) * 2020-03-16 2020-11-03 赵俊江 Multi-functional mathematical education demonstration board

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110093258A (en) * 2010-02-12 2011-08-18 삼성전자주식회사 Apparatus and method for transmitting and receiving map data
CN211843841U (en) * 2020-03-16 2020-11-03 赵俊江 Multi-functional mathematical education demonstration board
CN211764510U (en) * 2020-03-17 2020-10-27 昆明市官渡区职业高级中学 Multi-functional fine arts teaching blackboard
CN211427507U (en) * 2020-04-14 2020-09-04 李瑞东 Display board for preschool education cognition
CN111840792A (en) * 2020-08-21 2020-10-30 杭州宸武科技有限公司 Physiotherapy equipment for dermatology

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Application publication date: 20210928