CN112793340A - Rotatory curved surface mathematics teaching aid - Google Patents
Rotatory curved surface mathematics teaching aid Download PDFInfo
- Publication number
- CN112793340A CN112793340A CN202110004687.6A CN202110004687A CN112793340A CN 112793340 A CN112793340 A CN 112793340A CN 202110004687 A CN202110004687 A CN 202110004687A CN 112793340 A CN112793340 A CN 112793340A
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- Prior art keywords
- groove
- rod
- supporting rod
- fixedly connected
- threaded
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- 238000001179 sorption measurement Methods 0.000 claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims abstract description 26
- 239000011148 porous material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
- B43L12/00—Means to prevent slippage
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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
- B43L11/00—Non-circular-curve-drawing instruments
-
- 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
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
- B43L13/001—Mathematical drawing instruments
-
- 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
- B43L9/00—Circular curve-drawing or like instruments
- B43L9/02—Compasses
- B43L9/04—Beam compasses
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- Rehabilitation Tools (AREA)
Abstract
The invention relates to the technical field of teaching aids, and discloses a rotating surface mathematical teaching aid which comprises a first supporting rod, wherein one end of the first supporting rod is connected with an adsorption mechanism, one end of the first supporting rod, which is far away from the adsorption mechanism, is provided with a connecting groove, a rotating rod is rotatably connected in the connecting groove through a first bearing, the first bearing is fixedly arranged on the groove wall of the connecting groove, a second supporting rod is fixedly sleeved on the rotating rod, the second supporting rod is connected with a fixed rod through a connecting mechanism, one end of the fixed rod, which is far away from the second supporting rod, is fixedly connected with a clamping mechanism, the adsorption mechanism comprises a fixed block, an adsorption groove, a piston, a connecting rod, a through hole and two tension springs, the fixed block is fixedly connected at one end of the first supporting rod. This rotating surface mathematics teaching aid can adsorb first bracing piece on the blackboard, makes first bracing piece non-slip, and is more firm during the use, and the setting-out is more accurate.
Description
Technical Field
The invention relates to the technical field of teaching aids, in particular to a rotating surface mathematical teaching aid.
Background
The teaching aid is a general name of various appliances used by students for enabling the students to understand teaching contents visually and vividly and tools used by teachers during giving lessons, the teaching aid can improve learning interest of the students, perceptual knowledge is enriched, the students are helped to form clear concepts, observation ability and thinking ability of the students are developed, the teacher compasses are needed to be used when curves or circles are drawn in the current mathematical teaching, the teacher compasses are easy to slip from the supporting points of a blackboard, drawing is inaccurate, and teaching is influenced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a rotating curved surface mathematical teaching aid which has the advantages that a first support rod can be adsorbed on a blackboard, so that the first support rod is not easy to slip, is more stable in use, can draw a line more accurately and the like, and solves the problems that teachers easily slip at the supporting points of compasses and the blackboard, so that drawing is inaccurate and teaching is influenced.
(II) technical scheme
In order to realize the purposes that the first support rod can be adsorbed on the blackboard, so that the first support rod is not easy to slip, is more stable in use and can draw a line more accurately, the invention provides the following technical scheme: a mathematical teaching aid for a rotating curved surface comprises a first supporting rod, wherein one end of the first supporting rod is connected with an adsorption mechanism, one end of the first supporting rod, which is far away from the adsorption mechanism, is provided with a connecting groove, a rotating rod is rotatably connected in the connecting groove through a first bearing, the first bearing is fixedly arranged on the groove wall of the connecting groove, a second supporting rod is fixedly sleeved on the rotating rod, the second supporting rod is connected with a fixed rod through a connecting mechanism, and one end, which is far away from the second supporting rod, of the fixed rod is fixedly connected with a clamping mechanism;
the adsorption mechanism comprises a fixed block, an adsorption groove, a piston, a connecting rod, a through hole and two tension springs, the fixed block is fixedly connected to one end, away from the second supporting rod, of the first supporting rod, the adsorption groove is formed in the bottom of the fixed block, the piston is arranged in the adsorption groove, the connecting rod is fixedly connected to one side, close to the bottom of the adsorption groove, of the piston, the through hole is formed in the bottom of the adsorption groove, one end, away from the piston, of the connecting rod penetrates through the through hole and extends outwards, one ends of the two tension springs are fixedly connected to the bottom of the adsorption groove, and the other ends of the two tension springs are fixedly;
the connecting mechanism comprises a fixing groove, a threaded sleeve and a first threaded rod, the fixing groove is formed in one end, far away from the first supporting rod, of the second supporting rod, the threaded sleeve is rotatably connected to the groove wall, close to the notch, of the fixing groove through a second bearing, the second bearing is fixedly arranged on the groove wall of the fixing groove, the first threaded rod is inserted into the threaded sleeve and is in threaded connection with the threaded sleeve, and the other end of the first threaded rod is fixedly connected to the fixing rod;
fixture includes grip block, centre gripping hole, support groove, screw hole, second threaded rod and grip block, the one end that second branch was kept away from to the dead lever is fixed to the grip block, the centre gripping hole is seted up on the grip block, support the groove and set up on one side pore wall in centre gripping hole, the tank bottom in support groove is seted up to the screw hole, the second threaded rod pass the screw hole and with screw hole threaded connection, the grip block rotates the one end of connecting near the centre gripping hole at the second threaded rod through the third bearing, the third bearing is fixed to be established on the grip block.
Preferably, the threaded sleeve is fixedly sleeved with a rotating block.
Preferably, one end of the second threaded rod, which is far away from the clamping plate, is fixedly connected with a connecting block.
Preferably, one end of the connecting rod, which is far away from the piston, is fixedly connected with a pressure plate.
Preferably, one end, far away from the fixed rod, of the first threaded rod is fixedly connected to the moving block, sliding blocks are fixedly connected to two sides of the moving block, sliding grooves are formed in two side groove walls of the fixed groove, and the two sliding blocks are slidably connected in the corresponding sliding grooves respectively.
Preferably, a ball groove is formed in one end, close to the bottom of the sliding groove, of the sliding block, a ball is connected in the ball groove in a rolling mode, and one end, far away from the bottom of the ball groove, of the ball penetrates through a groove opening of the ball groove and is connected to the bottom of the sliding groove in a rolling mode.
Preferably, the groove opening of the ball groove is closed, and the diameter of the ball is larger than that of the groove opening of the ball groove.
Preferably, rubber pads are fixedly connected to the groove walls on the two sides of the connecting groove, and the rubber pads are abutted to the second supporting rod.
(III) advantageous effects
Compared with the prior art, the invention provides a rotating curved surface mathematical teaching aid, which has the following beneficial effects:
this rotatory curved surface mathematical education apparatus constitutes an adsorption apparatus through setting up fixed block, adsorption tank, piston, connecting rod, clearing hole and two extension springs, can adsorb first branch pole on the blackboard, makes first branch pole non-skid, and is more firm during the use, and the setting-out is more accurate.
Drawings
FIG. 1 is a schematic structural view of a rotating surface mathematical education tool provided by the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
fig. 4 is an enlarged view of a portion C in fig. 1.
In the figure: 1 first branch, 2 absorption mechanisms, 21 fixed block, 22 absorption grooves, 23 pistons, 24 connecting rods, 25 through holes, 26 extension springs, 3 connecting grooves, 4 rotating rods, 5 second branches, 6 connecting mechanisms, 61 fixed grooves, 62 threaded sleeves, 63 first threaded rods, 7 fixed rods, 8 clamping mechanisms, 81 clamping blocks, 82 clamping holes, 83 supporting grooves, 84 threaded holes, 85 second threaded rods, 86 clamping plates, 9 rotating blocks, 10 connecting blocks, 11 pressing plates, 12 moving blocks, 13 sliding blocks, 14 sliding grooves, 15 ball grooves, 16 balls and 17 rubber pads.
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. 1-4, a rotating curved surface mathematical teaching aid comprises a first supporting rod 1, wherein one end of the first supporting rod 1 is connected with an adsorption mechanism 2, one end of the first supporting rod 1, which is far away from the adsorption mechanism 2, is provided with a connecting groove 3, a rotating rod 4 is rotatably connected in the connecting groove 3 through a first bearing, the first bearing is fixedly arranged on the groove wall of the connecting groove 3, a second supporting rod 5 is fixedly sleeved on the rotating rod 4, the second supporting rod 5 is connected with a fixing rod 7 through a connecting mechanism 6, and one end of the fixing rod 7, which is far away from the second supporting rod 5, is fixedly connected with a clamping;
the adsorption mechanism 2 comprises a fixed block 21, an adsorption groove 22, a piston 23, a connecting rod 24, a through hole 25 and two tension springs 26, the fixed block 21 is fixedly connected to one end, far away from the second supporting rod 5, of the first supporting rod 1, the adsorption groove 22 is formed in the bottom of the fixed block 21, the piston 23 is arranged in the adsorption groove 22, the connecting rod 24 is fixedly connected to one side, close to the bottom of the adsorption groove 22, of the piston 23, the through hole 25 is formed in the bottom of the adsorption groove 22, one end, far away from the piston 23, of the connecting rod 24 penetrates through the through hole 25 and extends outwards, one ends of the two tension springs 26 are fixedly connected to the bottom of the adsorption groove 22, and the;
the connecting mechanism 6 comprises a fixing groove 61, a threaded sleeve 62 and a first threaded rod 63, the fixing groove 61 is formed in one end, far away from the first supporting rod 1, of the second supporting rod 5, the threaded sleeve 62 is rotatably connected to the groove wall, close to the notch, of the fixing groove 61 through a second bearing, the second bearing is fixedly arranged on the groove wall of the fixing groove 61, the first threaded rod 63 is inserted into the threaded sleeve 62 and is in threaded connection with the threaded sleeve 62, the other end of the first threaded rod 63 is fixedly connected to the fixing rod 7, the fixing rod 7 can be stretched, and different curves are drawn;
the clamping mechanism 8 comprises a clamping block 81, a clamping hole 82, a supporting groove 83, a threaded hole 84, a second threaded rod 85 and a clamping plate 86, the clamping block 81 is fixedly connected to one end of the fixing rod 7 far away from the second supporting rod 5, the clamping hole 82 is formed in the clamping block 81, the supporting groove 83 is formed in the wall of one side hole of the clamping hole 82, the threaded hole 84 is formed in the bottom of the supporting groove 83, the second threaded rod 85 penetrates through the threaded hole 84 and is in threaded connection with the threaded hole 84, the clamping plate 86 is rotatably connected to one end, close to the clamping hole 82, of the second threaded rod 85 through a third bearing, the third bearing is fixedly arranged on the clamping plate 86, a chalk or a blackboard pen can be clamped, the clamping effect is good, the rotating curved surface mathematical teaching tool is used for pressing the connecting rod 24 when a curve or a circle needs to be drawn on the blackboard, the connecting rod 24 drives the piston 23 to move, the piston 23 stretches, the connecting rod 24 is loosened, the piston 23 is pulled by the tension spring 26, the piston 23 pulls air in the adsorption groove 22, negative pressure is formed in the adsorption groove 22, the fixing block 21 is adsorbed on the blackboard, when the line drawing position needs to be adjusted, the threaded sleeve 62 is rotated, the first threaded rod 63 moves, the first threaded rod 63 drives the fixing rod 7 to move, the fixing rod 7 drives the clamping block 81 to move, chalk or blackboard pen is placed into the clamping hole 82, the second threaded rod 85 is rotated, the second threaded rod 85 drives the clamping plate 86 to move, the chalk or blackboard pen is clamped by the clamping plate 86, the first support rod 1 can be adsorbed on the blackboard, the first support rod 1 is not prone to slipping, the use is more stable, and line drawing is more accurate.
The threaded sleeve 62 is fixedly sleeved with the rotating block 9, and the rotating of the threaded sleeve 62 is more labor-saving.
One end of the second threaded rod 85 far away from the clamping plate 86 is fixedly connected with the connecting block 10, and the second threaded rod 85 is more labor-saving to rotate.
The end of the connecting rod 24 far away from the piston 23 is fixedly connected with the pressing plate 11, and the connecting rod 24 is pulled to be more stable.
One end fixed connection that dead lever 7 was kept away from to first threaded rod 63 is at movable block 12, and the equal fixedly connected with slider 13 in both sides of movable block 12 has all seted up spout 14 on the both sides cell wall of fixed slot 61, and two slider 13 sliding connection are respectively in corresponding spout 14, make first threaded rod 63 more firm, are difficult for rocking.
The ball groove 15 has been seted up to the one end that slider 13 is close to the spout 14 tank bottom, and ball 16 is connected with in the ball groove 15 roll, and the one end that ball 16 kept away from the ball groove 15 tank bottom passes the notch of ball groove 15 and roll connection at the tank bottom of spout 14, makes slider 13 remove more smoothly, is difficult for blocking.
The notch of the ball groove 15 is closed, and the diameter of the ball 16 is larger than that of the notch of the ball groove 15, so that the ball 16 cannot be separated from the ball groove 15.
All fixedly connected with rubber pad 17 on the both sides cell wall of spread groove 3, rubber pad 17 offsets with second branch 5, increases the damping and feels, and first branch 1 and second branch 5 are difficult for rocking at will.
To sum up, the mathematical education tool with a rotating curved surface is characterized in that when a curve or a circle needs to be drawn on a blackboard, the connecting rod 24 is pressed, the connecting rod 24 drives the piston 23 to move, the piston 23 stretches the tension spring 26 to press the notch of the adsorption groove 22 against the blackboard, the connecting rod 24 is loosened, the tension spring 26 pulls the piston 23, the piston 23 pulls air in the adsorption groove 22, negative pressure is formed in the adsorption groove 22, the fixed block 21 is adsorbed on the blackboard, when the line drawing position needs to be adjusted, the threaded sleeve 62 is rotated, the first threaded rod 63 moves, the first threaded rod 63 drives the fixed rod 7 to move, the fixed rod 7 drives the clamping block 81 to move, chalk or blackboard pen is placed in the clamping hole 82, the second threaded rod 85 is rotated, the second threaded rod 85 drives the clamping plate 86 to move, the clamping plate 86 clamps the chalk or blackboard pen, the first supporting rod 1 can be adsorbed on the blackboard, and the first supporting, the use is more firm, and the setting-out is more accurate.
It is to be noted that 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a rotating surface mathematics teaching aid, includes first branch (1), its characterized in that: one end of the first supporting rod (1) is connected with an adsorption mechanism (2), one end, far away from the adsorption mechanism (2), of the first supporting rod (1) is provided with a connecting groove (3), a rotating rod (4) is rotatably connected into the connecting groove (3) through a first bearing, the first bearing is fixedly arranged on the groove wall of the connecting groove (3), a second supporting rod (5) is fixedly sleeved on the rotating rod (4), the second supporting rod (5) is connected with a fixing rod (7) through a connecting mechanism (6), and one end, far away from the second supporting rod (5), of the fixing rod (7) is fixedly connected with a clamping mechanism (8);
the adsorption mechanism (2) comprises a fixed block (21), an adsorption groove (22), a piston (23), a connecting rod (24), a through hole (25) and two tension springs (26), the fixed block (21) is fixedly connected with one end of the first supporting rod (1) far away from the second supporting rod (5), the adsorption groove (22) is arranged at the bottom of the fixed block (21), the piston (23) is arranged in the adsorption groove (22), the connecting rod (24) is fixedly connected with one side of the piston (23) close to the bottom of the adsorption groove (22), the through hole (25) is formed in the bottom of the adsorption groove (22), one end, far away from the piston (23), of the connecting rod (24) penetrates through the through hole (25) and extends outwards, one ends of the two tension springs (26) are fixedly connected to the bottom of the adsorption groove (22), and the other ends of the two tension springs (26) are fixedly connected to the corresponding side of the piston (23);
the connecting mechanism (6) comprises a fixing groove (61), a threaded sleeve (62) and a first threaded rod (63), the fixing groove (61) is formed in one end, far away from the first supporting rod (1), of the second supporting rod (5), the threaded sleeve (62) is rotatably connected to the groove wall, close to the notch, of the fixing groove (61) through a second bearing, the second bearing is fixedly arranged on the groove wall of the fixing groove (61), the first threaded rod (63) is inserted into the threaded sleeve (62) and is in threaded connection with the threaded sleeve (62), and the other end of the first threaded rod (63) is fixedly connected to the fixing rod (7);
fixture (8) are including grip block (81), grip hole (82), support groove (83), screw hole (84), second threaded rod (85) and grip block (86), the one end of second branch (5) is kept away from in grip block (81) fixed connection dead lever (7), grip hole (82) are seted up on grip block (81), support groove (83) and set up on one side pore wall of grip hole (82), the tank bottom at support groove (83) is seted up in screw hole (84), second threaded rod (85) pass screw hole (84) and with screw hole (84) threaded connection, grip block (86) rotate through the third bearing and connect the one end that is close to grip hole (82) in second threaded rod (85), the third bearing is fixed to be established on grip block (86).
2. The rotating surface mathematical education tool according to claim 1, characterized in that: the threaded sleeve (62) is fixedly sleeved with a rotating block (9).
3. The rotating surface mathematical education tool according to claim 1, characterized in that: and one end of the second threaded rod (85) far away from the clamping plate (86) is fixedly connected with a connecting block (10).
4. The rotating surface mathematical education tool according to claim 1, characterized in that: and one end of the connecting rod (24) far away from the piston (23) is fixedly connected with a pressure plate (11).
5. The rotating surface mathematical education tool according to claim 1, characterized in that: one end, far away from the fixing rod (7), of the first threaded rod (63) is fixedly connected to the moving block (12), sliding blocks (13) are fixedly connected to two sides of the moving block (12), sliding grooves (14) are formed in two side groove walls of the fixing groove (61), and the two sliding blocks (13) are respectively connected to the corresponding sliding grooves (14) in a sliding mode.
6. The rotating surface mathematical education tool according to claim 5, characterized in that: the ball groove (15) has been seted up to slider (13) one end near spout (14) tank bottom, roll in ball groove (15) and be connected with ball (16), ball (16) are kept away from the one end of ball groove (15) tank bottom and are passed the notch of ball groove (15) and roll connection at the tank bottom of spout (14).
7. The rotating surface mathematical education tool according to claim 6, characterized in that: the notch of the ball groove (15) is closed, and the diameter of the ball (16) is larger than that of the notch of the ball groove (15).
8. The rotating surface mathematical education tool according to claim 1, characterized in that: rubber pads (17) are fixedly connected to the groove walls on the two sides of the connecting groove (3), and the rubber pads (17) are abutted to the second supporting rod (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110004687.6A CN112793340A (en) | 2021-01-04 | 2021-01-04 | Rotatory curved surface mathematics teaching aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110004687.6A CN112793340A (en) | 2021-01-04 | 2021-01-04 | Rotatory curved surface mathematics teaching aid |
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| Publication Number | Publication Date |
|---|---|
| CN112793340A true CN112793340A (en) | 2021-05-14 |
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ID=75808013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110004687.6A Pending CN112793340A (en) | 2021-01-04 | 2021-01-04 | Rotatory curved surface mathematics teaching aid |
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| CN (1) | CN112793340A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5542185A (en) * | 1994-04-15 | 1996-08-06 | Fiskars Inc. | Device for describing arcs |
| CN207955117U (en) * | 2018-06-05 | 2018-10-12 | 欧阳德分 | A kind of novel mathematics teaching compasses |
| CN208630188U (en) * | 2018-04-08 | 2019-03-22 | 麦凌霞 | A kind of mathematics drawing instruments |
| CN209336345U (en) * | 2018-12-25 | 2019-09-03 | 朱广军 | A kind of new type blackboard drawing tool convenient for mathematical education |
| CN209351136U (en) * | 2018-03-06 | 2019-09-06 | 何路 | A kind of mathematical education cyclograph |
| CN211416767U (en) * | 2020-01-14 | 2020-09-04 | 芮广亚 | Mathematics compasses chi of teaching usefulness |
| CN211493449U (en) * | 2019-08-20 | 2020-09-15 | 滁州学院 | Compasses capable of randomly adjusting radius and length |
-
2021
- 2021-01-04 CN CN202110004687.6A patent/CN112793340A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5542185A (en) * | 1994-04-15 | 1996-08-06 | Fiskars Inc. | Device for describing arcs |
| CN209351136U (en) * | 2018-03-06 | 2019-09-06 | 何路 | A kind of mathematical education cyclograph |
| CN208630188U (en) * | 2018-04-08 | 2019-03-22 | 麦凌霞 | A kind of mathematics drawing instruments |
| CN207955117U (en) * | 2018-06-05 | 2018-10-12 | 欧阳德分 | A kind of novel mathematics teaching compasses |
| CN209336345U (en) * | 2018-12-25 | 2019-09-03 | 朱广军 | A kind of new type blackboard drawing tool convenient for mathematical education |
| CN211493449U (en) * | 2019-08-20 | 2020-09-15 | 滁州学院 | Compasses capable of randomly adjusting radius and length |
| CN211416767U (en) * | 2020-01-14 | 2020-09-04 | 芮广亚 | Mathematics compasses chi of teaching usefulness |
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Application publication date: 20210514 |
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