CN111098624A - English teaching aid is used in english letter study - Google Patents
English teaching aid is used in english letter study Download PDFInfo
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- CN111098624A CN111098624A CN202010038397.9A CN202010038397A CN111098624A CN 111098624 A CN111098624 A CN 111098624A CN 202010038397 A CN202010038397 A CN 202010038397A CN 111098624 A CN111098624 A CN 111098624A
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- 230000000694 effects Effects 0.000 abstract description 6
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- 238000010586 diagram Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000001902 propagating effect Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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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
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
- B43L13/02—Draughting machines or drawing devices for keeping parallelism
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Abstract
The invention provides an English teaching aid for learning English letters, which comprises a blackboard body, wherein grooves are formed in the blackboard body, the outer walls of two sides of the blackboard body are respectively connected with a first fixing plate, a rotating shaft is rotatably connected between the two first fixing plates, the rotating shaft penetrates through the first fixing plates to extend outwards and is connected with a handle, the outer walls of two sides of the blackboard body are respectively connected with a second fixing plate, the outer wall of the second fixing plate is rotatably connected with a lead screw, the outer wall of the rotating shaft is connected with a first bevel gear, the outer wall of the first bevel gear is meshed with a second bevel gear, the second bevel gear is connected with the outer wall of the lead screw, the outer walls of the two lead screws are respectively in threaded connection with sleeves, the outer walls of the two sleeves. The English teaching aid for learning English letters provided by the invention can assist in marking off, guide students to write letters in a standard way and improve the writing effect of the students.
Description
Technical Field
The invention relates to the technical field of English teaching aids, in particular to an English teaching aid for learning English letters.
Background
English teaching is a process that moves gradually, no matter be to the english or not the people of first language, english study is all crucial today in globalization rapid development, many countries all regard english as must study the language, the teaching aid that uses in the english classroom is also more important, the teaching aid is with the material object of propagating science and technology, educator as the purpose, complete science and technology media is, be indispensable equipment in teenagers' scientific and technological activity, especially abstract knowledge application teaching aid enables knowledge visualization, concretize, the animation.
At present, the english class has all been seted up to middle and primary schools, but the teaching aid that is fit for middle and primary schools english class teaching is very lacking, and especially the teaching aid of learning english letter is more rare, and primary school english mr often needs the teaching aid of letter study in order to improve student's interest when the teaching.
Along with the wide spread of english, student's english is write nonstandard, is unfavorable for ceramic temperament and exercises, and current english teaching aid can not assist the marking off, and the teacher can only hand animation auxiliary line, and the line segment of hand animation is more crooked, and the distance between the line segment is not of uniform size, is not convenient for guide student's the standard of writing, can not improve the student to the writing effect of letter.
Therefore, it is necessary to provide an english teaching aid for learning english letters to solve the above technical problems.
Disclosure of Invention
The invention provides an English teaching aid for learning English letters, which solves the technical problems that the existing English teaching aid cannot assist in marking, cannot guide each letter, is inconvenient for guiding the writing specification of students, and cannot improve the writing effect of the students on the letters.
In order to solve the technical problems, the invention provides an English teaching aid for learning English letters, which comprises a blackboard body, wherein grooves are formed in the blackboard body, first fixing plates are connected to the outer walls of the two sides of the blackboard body, a rotating shaft is rotatably connected between the two first fixing plates, the rotating shaft penetrates through the first fixing plates to extend outwards and is connected with a handle, the outer walls of the two sides of the blackboard body are respectively connected with a second fixing plate, a screw rod is rotatably connected to the outer wall of the second fixing plate, a first bevel gear is connected to the outer wall of the rotating shaft, a second bevel gear is meshed and connected to the outer wall of the first bevel gear, the second bevel gear is connected to the outer wall of the screw rod, sleeves are respectively connected to the outer walls of the two screw rods in a threaded manner, connecting rods are respectively connected to the, the inner wall of the box body is connected with a rope piece, one end, far away from the box body, of the rope piece is connected with a pull ring, and the straight rod is movably connected in the pull ring.
Preferably, the outer wall of the straight rod is provided with a concave hole, and the pull ring is movably connected to the inner wall of the concave hole.
Preferably, the outer wall of the blackboard main body is provided with scale marks.
Preferably, the inner wall of the box body is rotatably connected with a rotating shaft, the rope piece is sleeved on the outer wall of the rotating shaft, the outer wall of the rotating shaft is connected with two baffles, and the rope piece is connected between the two baffles.
Preferably, the pivot passes the box and outwards extends and is connected with the knob, the locating hole has been dug to the knob outer wall, locating hole inner wall swing joint has the locating lever, box outer wall connection has the mount, locating lever sliding connection is in the mount, locating lever outer wall connection has the limiting plate, the locating lever outer wall has cup jointed elastic element, elastic element arranges in between the inner wall of limiting plate and mount.
Preferably, the elastic member may be a spring.
Preferably, the box body is connected with a box door through a hinge.
Preferably, the inner wall of the box body is connected with two tube bodies, the inner walls of the two tube bodies are connected with chalk pieces, and the rope piece is movably connected between the two chalk pieces.
Compared with the prior art, the English teaching aid for learning English letters provided by the invention has the following beneficial effects:
the invention provides an English teaching aid for learning English letters, which can assist in marking on a blackboard by smearing chalk marks on a rope piece, guide students to conduct standard writing on the letters and improve the writing effect of the students on each English letter.
The teaching aid is when using, through rotating the handle, make the first bevel gear of axis of rotation and the second bevel gear intermeshing on the lead screw, thereby make the lead screw rotate, make the sleeve on the lead screw reciprocate at the lead screw outer wall, the sleeve of both sides is in same water flat line, make the box be located same water flat line with the straight-bar, avoid rope spare skew, the pulling rope spare, make rope spare drag out from the box, make straight-bar and pull ring cooperation, rope spare is in the outside of blackboard this moment, through scribbling the chalk dust at rope spare outer wall, the pulling rope spare, make rope spare bullet on the blackboard, the chalk dust that scribbles in the rope spare outside can be infected with on the blackboard, thereby supplementary marking off on the blackboard.
Through setting up two chalk spare in box inside, the rope spare makes the chalk spare rotate when pulling out, makes the rope spare be infected with the chalk dust, can be after pulling out the rope spare, directly stir the rope spare, makes the chalk dust on the rope spare be infected with on the blackboard, saves operating time.
Drawings
FIG. 1 is a first schematic structural diagram of an English teaching aid for learning English letters according to the present invention;
FIG. 2 is a schematic structural diagram of an English teaching aid for learning English letters according to the present invention;
FIG. 3 is a schematic structural diagram of part A in FIG. 2 of an English teaching aid for learning English letters according to the present invention;
fig. 4 is a schematic structural diagram of an english teaching aid case for learning english letters provided by the present invention.
Reference numbers in the figures: 1. a blackboard main body; 101. a groove; 2. a first fixing plate; 3. a rotating shaft; 301. a first bevel gear; 4. a handle; 5. a second fixing plate; 6. a screw rod; 601. a second bevel gear; 7. a sleeve; 8. a connecting rod; 9. a box body; 10. a straight rod; 11. a rope member; 12. a pull ring; 13. concave holes; 14. a rotating shaft; 141. a baffle plate; 15. a knob; 151. positioning holes; 16. positioning a rod; 17. a fixed mount; 18. a limiting plate; 19. an elastic element; 20. a box door; 21. a pipe body; 22. a chalk member.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
please refer to fig. 1, fig. 2 and fig. 3 in combination, where fig. 1 is a schematic structural diagram of an english teaching aid for learning english alphabets according to the present invention, fig. 2 is a schematic structural diagram of an english teaching aid for learning english alphabets according to the present invention, and fig. 3 is a schematic structural diagram of part a in fig. 2 of an english teaching aid for learning english alphabets according to the present invention. An English teaching aid for learning English letters comprises a blackboard body 1, grooves 101 are formed in the blackboard body 1, first fixing plates 2 are connected to the outer walls of two sides of the blackboard body 1, a rotating shaft 3 is rotatably connected between the two first fixing plates 2, the rotating shaft 3 extends outwards through the first fixing plates 2 and is connected with a handle 4, second fixing plates 5 are connected to the outer walls of two sides of the blackboard body 1, lead screws 6 are rotatably connected to the outer walls of the second fixing plates 5, first bevel gears 301 are connected to the outer walls of the rotating shaft 3, second bevel gears 601 are meshed and connected to the outer walls of the lead screws 6, sleeves 7 are connected to the outer walls of the two lead screws 6 through threads, connecting rods 8 are connected to the outer walls of the two sleeves 7, a box body 9 and a straight rod 10 are connected to one ends, away from the sleeves 7, of the two connecting rods 8, a, one end of the rope piece 11, which is far away from the box body 9, is connected with a pull ring 12, the straight rod 10 is movably connected in the pull ring 12, a concave hole 13 is formed in the outer wall of the straight rod 10, the pull ring 12 is movably connected on the inner wall of the concave hole 13, and scale marks are arranged on the outer wall of the blackboard main body 1.
When the auxiliary marking for drawing letters on the blackboard is needed, the handle 4 is rotated to drive the rotating shaft 3 to rotate by rotating the handle 4, so that the first bevel gear 301 on the rotating shaft 3 is meshed with the second bevel gear 601 on the screw rod 6, the screw rod 6 is rotated, the sleeve 7 on the screw rod 6 moves up and down on the outer wall of the screw rod 6, the sleeves 7 on two sides are positioned at the same horizontal line, the box body 9 and the straight rod 10 are positioned at the same horizontal line, the rope 11 is prevented from being inclined, the rope 11 is pulled to pull the rope 11 out of the box body 9, the straight rod 10 is matched with the pull ring 12, the concave hole 13 on the outer side of the straight rod 10 can prevent the pull ring 12 from falling off from the straight rod 10, the rope 11 is positioned at the outer side of the blackboard at the moment, the rope 11 is stirred by coating chalk dust on the outer wall of the rope 11, the rope 11 is made to bounce on the blackboard, and the chalk dust coated, when other lines of auxiliary lines need to be drawn, the handle 4 continues to be rotated, so that the sleeve 7 continues to move upwards or downwards on the outer wall of the screw rod 6, and the scale marks are arranged on the outer side of the blackboard main body 1, so that the distances between the auxiliary lines in each line are equal, and the drawn lines are standard.
Example 2:
please refer to fig. 1, fig. 2, fig. 3 and fig. 4 in combination, where fig. 1 is a schematic structural diagram of a first english teaching aid for learning english alphabets provided by the present invention, fig. 2 is a schematic structural diagram of a second english teaching aid for learning english alphabets provided by the present invention, fig. 3 is a schematic structural diagram of a part a in fig. 2 of an english teaching aid for learning english alphabets provided by the present invention, and fig. 4 is a schematic structural diagram of a case of an english teaching aid for learning english alphabets provided by the present invention.
An English teaching aid for learning English letters comprises a blackboard body 1, grooves 101 are formed in the blackboard body 1, first fixing plates 2 are connected to the outer walls of two sides of the blackboard body 1, a rotating shaft 3 is rotatably connected between the two first fixing plates 2, the rotating shaft 3 extends outwards through the first fixing plates 2 and is connected with a handle 4, second fixing plates 5 are connected to the outer walls of two sides of the blackboard body 1, lead screws 6 are rotatably connected to the outer walls of the second fixing plates 5, first bevel gears 301 are connected to the outer walls of the rotating shaft 3, second bevel gears 601 are meshed and connected to the outer walls of the lead screws 6, sleeves 7 are connected to the outer walls of the two lead screws 6 through threads, connecting rods 8 are connected to the outer walls of the two sleeves 7, a box body 9 and a straight rod 10 are connected to one ends, away from the sleeves 7, of the two connecting rods 8, a, one end of a rope piece 11 far away from a box body 9 is connected with a pull ring 12, a straight rod 10 is movably connected in the pull ring 12, the outer wall of the straight rod 10 is provided with a concave hole 13, the pull ring 12 is movably connected with the inner wall of the concave hole 13, the outer wall of a blackboard main body 1 is provided with scale marks, the inner wall of the box body 9 is rotatably connected with a rotating shaft 14, the rope piece 11 is sleeved on the outer wall of the rotating shaft 14, the outer wall of the rotating shaft 14 is connected with two baffles 141, the rope piece 11 is connected between the two baffles 141, the rotating shaft 14 penetrates through the box body 9 and extends outwards to be connected with a knob 15, the outer wall of the knob 15 is provided with a positioning hole 151, the inner wall of the positioning hole 151 is movably connected with a positioning rod 16, the outer wall of the box body 9 is connected with a fixing frame 17, the positioning rod, the inner wall of the box body 9 is connected with two tube bodies 21, the inner walls of the two tube bodies 21 are connected with chalk pieces 22, and the rope piece 11 is movably connected between the two chalk pieces 22.
When auxiliary marking for drawing letters on a blackboard is needed, the handle 4 is rotated to enable the handle 4 to drive the rotating shaft 3 to rotate, the first bevel gear 301 on the rotating shaft 3 is meshed with the second bevel gear 601 on the screw rod 6, so that the screw rod 6 rotates, the sleeve 7 on the screw rod 6 moves up and down on the outer wall of the screw rod 6, the sleeves 7 on two sides are positioned on the same horizontal line, the box body 9 and the straight rod 10 are positioned on the same horizontal line to avoid the rope 11 from being inclined, the positioning rod 16 is pulled, the elastic element 19 contracts to enable the positioning rod 16 to move out of the knob 15 to avoid the knob 15 from being blocked and incapable of rotating, the rope 11 is pulled to enable the rope 11 to be pulled out of the box body 9, when the rope 11 is pulled out of the box body 9 and positioned behind two chalk pieces 22, the rope 11 is pulled to enable the rope 11 to drive the chalk pieces 22 to rotate, so that the outer wall of the rope 11, at this time, the positioning rod 16 is loosened, the positioning rod 16 enters the positioning hole 151 again under the action of the elastic element 19, the pulled rope 11 is prevented from loosening, the concave hole 13 in the outer side of the straight rod 10 can prevent the pull ring 12 from falling off from the straight rod 10, the rope 11 is located in the outer side of the blackboard at this time, the rope 11 can be directly pulled, chalk dust stained on the outer side of the rope 11 falls on the blackboard, the two chalk parts 22 are arranged inside the box body 9, the rope 11 enables the chalk parts 22 to rotate while being pulled out, the rope 11 is stained with the chalk dust, the rope 11 can be directly pulled after the rope 11 is pulled out, the chalk dust on the rope 11 is stained on the blackboard, and the operation time is saved.
The working principle of the English teaching aid for learning English letters provided by the invention is as follows:
when auxiliary marking for drawing letters on a blackboard is needed, the handle 4 is rotated to enable the handle 4 to drive the rotating shaft 3 to rotate, the first bevel gear 301 on the rotating shaft 3 is meshed with the second bevel gear 601 on the screw rod 6, so that the screw rod 6 rotates, the sleeve 7 on the screw rod 6 moves up and down on the outer wall of the screw rod 6, the sleeves 7 on two sides are positioned on the same horizontal line, the box body 9 and the straight rod 10 are positioned on the same horizontal line to avoid the rope 11 from being inclined, the positioning rod 16 is pulled, the elastic element 19 contracts to enable the positioning rod 16 to move out of the knob 15 to avoid the knob 15 from being blocked and incapable of rotating, the rope 11 is pulled to enable the rope 11 to be pulled out of the box body 9, when the rope 11 is pulled out of the box body 9 and positioned behind two chalk pieces 22, the rope 11 is pulled to enable the rope 11 to drive the chalk pieces 22 to rotate, so that the outer wall of the rope 11, at this time, the positioning rod 16 is loosened, so that the positioning rod 16 enters the positioning hole 151 again under the action of the elastic element 19, the pulled-out rope piece 11 is prevented from loosening, the concave hole 13 on the outer side of the straight rod 10 can prevent the pull ring 12 from falling off from the straight rod 10, the rope piece 11 is located on the outer side of the blackboard at this time, the rope piece 11 can be directly stirred, and chalk dust stained on the outer side of the rope piece 11 falls on the blackboard.
Compared with the prior art, the English teaching aid for learning English letters provided by the invention has the following beneficial effects:
1. the invention provides an English teaching aid for learning English letters, which can assist in marking on a blackboard by smearing chalk marks on a rope piece, guide students to conduct standard writing on the letters and improve the writing effect of the students on each English letter.
2. Through setting up two chalk spare in box inside, rope spare makes the chalk spare rotate when pulling out, makes rope spare be infected with the chalk dust, can directly stir rope spare after pulling out rope spare, makes the chalk dust on the rope spare be infected with on the blackboard, need not to paint the chalk dust in the rope spare outside, saves operating time.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides an english teaching aid for english letter study, includes blackboard main part (1), its characterized in that, it has recess (101) to open in blackboard main part (1), blackboard main part (1) both sides outer wall all is connected with first fixed plate (2), two rotate between first fixed plate (2) and be connected with axis of rotation (3), axis of rotation (3) pass first fixed plate (2) and outwards extend and be connected with handle (4), blackboard main part (1) both sides outer wall all is connected with second fixed plate (5), second fixed plate (5) outer wall rotates and is connected with lead screw (6), axis of rotation (3) outer wall is connected with first bevel gear (301), first bevel gear (301) outer wall meshing is connected with second bevel gear (601), second bevel gear (601) is connected at the outer wall of lead screw (6), two equal threaded connection of lead screw (6) outer wall has sleeve (7), two sleeve (7) outer wall all is connected with connecting rod (8), two the one end that sleeve (7) were kept away from in connecting rod (8) is connected with box (9) and straight-bar (10) respectively, box (9) inner wall connection has rope spare (11), the one end that box (9) were kept away from in rope spare (11) is connected with pull ring (12), straight-bar (10) swing joint is in pull ring (12).
2. An English teaching aid for learning English letters according to claim 1, wherein the outer wall of the straight rod (10) is provided with a concave hole (13), and the pull ring (12) is movably connected to the inner wall of the concave hole (13).
3. An English teaching aid for learning English letters according to claim 1, characterized in that the outer wall of the blackboard body (1) is provided with scale marks.
4. An English teaching aid for learning English letters according to claim 1, characterized in that the inner wall of the box (9) is rotatably connected with a rotating shaft (14), the rope (11) is sleeved on the outer wall of the rotating shaft (14), the outer wall of the rotating shaft (14) is connected with two baffles (141), and the rope (11) is connected between the two baffles (141).
5. The English teaching aid is used in english alphabet study of claim 4, characterized in that, pivot (14) pass box (9) and outwards extend and be connected with knob (15), knob (15) outer wall is dug there is locating hole (151), locating hole (151) inner wall swing joint has locating lever (16), box (9) outer wall connection has mount (17), locating lever (16) sliding connection is in mount (17), locating lever (16) outer wall connection has limiting plate (18), locating lever (16) outer wall has cup jointed elastic element (19), elastic element (19) are arranged in between the inner wall of limiting plate (18) and mount (17).
6. A teaching tool for English letters learning according to claim 5, wherein said elastic member (19) is a spring.
7. An English teaching aid for learning English letters according to claim 5, characterized in that the box body (9) is connected with a box door (20) through a hinge.
8. An English teaching aid for learning English letters according to claim 7, characterized in that two tubes (21) are connected to the inner wall of the box (9), two chalk members (22) are connected to the inner walls of the tubes (21), and the rope member (11) is movably connected between the two chalk members (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038397.9A CN111098624A (en) | 2020-01-14 | 2020-01-14 | English teaching aid is used in english letter study |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038397.9A CN111098624A (en) | 2020-01-14 | 2020-01-14 | English teaching aid is used in english letter study |
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| CN111098624A true CN111098624A (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010038397.9A Pending CN111098624A (en) | 2020-01-14 | 2020-01-14 | English teaching aid is used in english letter study |
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| CA2187506A1 (en) * | 1994-05-23 | 1995-11-30 | Leopoldo E. Millen, Jr. | Retractable chalk line device |
| CN2218062Y (en) * | 1994-10-28 | 1996-01-24 | 郭开永 | grey line device |
| CN201366879Y (en) * | 2008-12-15 | 2009-12-23 | 刘婷 | Novel blackboard newspaper board |
| CN102229139A (en) * | 2011-06-17 | 2011-11-02 | 中国水利水电第五工程局有限公司 | Magnetic base line snapping device |
| CN204414918U (en) * | 2015-02-15 | 2015-06-24 | 刘岩 | A kind of blackboard being convenient to English teaching |
| CN205255833U (en) * | 2015-12-29 | 2016-05-25 | 高杨 | Blackboard for english teaching |
| CN107696750A (en) * | 2017-09-29 | 2018-02-16 | 南丹县职业教育中心 | A kind of multifunctional blackboard for education |
| CN208324736U (en) * | 2018-04-03 | 2019-01-04 | 李�浩 | A kind of construction line tool |
| CN109623764A (en) * | 2018-12-27 | 2019-04-16 | 曾冬英 | A kind of line-plotting device that architectural engineering uses |
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2020
- 2020-01-14 CN CN202010038397.9A patent/CN111098624A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2187506A1 (en) * | 1994-05-23 | 1995-11-30 | Leopoldo E. Millen, Jr. | Retractable chalk line device |
| US5509616A (en) * | 1994-05-23 | 1996-04-23 | Millen, Jr.; Leopoldo E. | Retractable chalk line device |
| CN2218062Y (en) * | 1994-10-28 | 1996-01-24 | 郭开永 | grey line device |
| CN201366879Y (en) * | 2008-12-15 | 2009-12-23 | 刘婷 | Novel blackboard newspaper board |
| CN102229139A (en) * | 2011-06-17 | 2011-11-02 | 中国水利水电第五工程局有限公司 | Magnetic base line snapping device |
| CN204414918U (en) * | 2015-02-15 | 2015-06-24 | 刘岩 | A kind of blackboard being convenient to English teaching |
| CN205255833U (en) * | 2015-12-29 | 2016-05-25 | 高杨 | Blackboard for english teaching |
| CN107696750A (en) * | 2017-09-29 | 2018-02-16 | 南丹县职业教育中心 | A kind of multifunctional blackboard for education |
| CN208324736U (en) * | 2018-04-03 | 2019-01-04 | 李�浩 | A kind of construction line tool |
| CN109623764A (en) * | 2018-12-27 | 2019-04-16 | 曾冬英 | A kind of line-plotting device that architectural engineering uses |
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Application publication date: 20200505 |