CN109360452A - Teaching writing/playing system - Google Patents

Teaching writing/playing system Download PDF

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Publication number
CN109360452A
CN109360452A CN201811244625.7A CN201811244625A CN109360452A CN 109360452 A CN109360452 A CN 109360452A CN 201811244625 A CN201811244625 A CN 201811244625A CN 109360452 A CN109360452 A CN 109360452A
Authority
CN
China
Prior art keywords
frame
rear baffle
lamp bead
sliding shoe
threaded rod
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
CN201811244625.7A
Other languages
Chinese (zh)
Inventor
王敬敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Shenyun Photoelectric Technology Co Ltd
Original Assignee
Anhui Shenyun Photoelectric Technology Co Ltd
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 Anhui Shenyun Photoelectric Technology Co Ltd filed Critical Anhui Shenyun Photoelectric Technology Co Ltd
Priority to CN201811244625.7A priority Critical patent/CN109360452A/en
Publication of CN109360452A publication Critical patent/CN109360452A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G09B5/00Electrically-operated educational appliances
    • G09B5/02Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20954Modifications to facilitate cooling, ventilating, or heating for display panels

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Business, Economics & Management (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Drawing Aids And Blackboards (AREA)

Abstract

The present invention proposes a kind of teaching writing/playing system, and touch display screen, backboard are set in the frame of electric whiteboard system, and backboard sets image sensor array;Heat-conducting plate and radiating fin are set on rear side of backboard;Filter layer and rear baffle are set on rear side of frame;Rear baffle sets air hole;Controller is set in frame, is electrically connected with touch display screen and image sensor array;Munnion sets slide bar, above sets sliding shoe, and sliding shoe sets laser lamp bead;Drive block is set on rear side of rear baffle, is screwed on threaded rod;The output axis connection of threaded rod lower end and driving motor;Guide runner is set on rear side of rear baffle, is slidedly arranged on guide slide;Threaded rod and guide slide are set to support plate, support on case;Video recording system includes support frame and camera;Universal wheel is set below support case and support frame;Server is set in support case, is communicated to connect with controller and camera.The present invention is easy to remove, and electronic whiteboard height can be adjusted;Good heat dissipation effect;Insect prevention is dust-proof;Four line lattice, five line lattice etc. are formed by laser lamp bead.

Description

Teaching writing/playing system
Technical field
The present invention relates to educational facilities technical field, specifically a kind of teaching writing/playing system.
Background technique
With the development of science and technology multimedia interactive teaching is universal, intelligent recorded broadcast has obtained quick development, intelligent recorded broadcast In, PPT electronic courseware needs to present by electronic whiteboard, and PPT electronic courseware fully utilizes all resources, including electronics is white The matched teaching resources library of plate software and Internet resources, using the PPT courseware that both pictures and texts are excellent, along with necessary animation regards Frequency etc., enriches teaching electronic courseware.But fixation is often arranged in recording and broadcasting system, and it is not easily shifted, it is unable to satisfy in different fields Close carry out using demand.
Currently, the height of electronic whiteboard in the market inconvenient adjustment electronic whiteboard when in use, for making for different heights User is difficult to generally adapt to.In addition, the heat dissipation performance of existing some electronic whiteboards is not high, and due to depositing with heat release hole It is also easily accessible inside electronic whiteboard in, some tiny mosquitoes and dust, leads to the damage of internal element.
Summary of the invention
The present invention proposes a kind of teaching writing/playing system, solves that recording and broadcasting system in the prior art is not easily shifted, electronic whiteboard The problems such as height adjustment is inconvenient, heat dissipation performance is poor.
The technical scheme of the present invention is realized as follows:
A kind of teaching writing/playing system, including electric whiteboard system, video recording system and server;
The electric whiteboard system includes the frame of rectangle, and touch display screen is provided in the frame, and described touch shows It is provided with backboard behind display screen, image sensor array is set towards the touch display screen side on the backboard;The backboard Rear side heat-conducting plate is set, several radiating fins are arranged in the rear side of the heat-conducting plate;
Rear baffle is arranged in the rear side of the frame, forms heat dissipation cavity between the rear baffle and the heat-conducting plate;After described Filter layer is provided on front side of baffle;Several air holes are opened up on the rear baffle;
Controller is set in the frame, and the controller is electric with the touch display screen and image sensor array respectively Connection;
The slide bar of vertical direction is provided on front side of one munnion of the frame, be arranged on the slide bar it is several can be along institute The sliding shoe of sliding bar is stated, laser lamp bead and lamp bead switch are set on the sliding shoe, battery, institute are set in the sliding shoe Battery is stated to be electrically connected with the laser lamp bead and lamp bead switch;
A drive block is provided on rear side of the rear baffle, the drive block has the screw hole of the break-through of a vertical direction, The drive block is screwed on a threaded rod;The upper end of the threaded rod is set in upper bearing (metal), and the upper bearing (metal) is set to upper fixation On seat, fixed seat is provided with fixedly connected part;The lower end of the threaded rod is arranged in lower bearing, the lower bearing On lower fixed seat, the lower fixed seat is provided with lower fixedly connected part;The lower end of the threaded rod and driving motor it is defeated Axis connection out, the driving motor are set on motor cabinet, and the motor cabinet is connected with the lower fixed seat;
Guide runner is provided on rear side of the rear baffle, the guide runner is slidedly arranged on guide slide, the guiding Slideway is provided with middle fixedly connected part;
Fixed connector, middle fixedly connected part and lower fixedly connected part are fixed in a support plate;The support The lower section setting of plate is provided with the first universal wheel below the support case on support case;
The video recording system includes support frame, and the top of support frame as described above is arranged camera, sets below support frame as described above It is equipped with the second universal wheel;
The server is set in the support case;The server respectively with the controller and camera communication link It connects.
Further, the cross section of the slide bar is square;The sliding shoe is cuboid, and the sliding shoe is equipped with The through-hole of square, the slide bar pass through the through-hole;Rubber pad, the rubber are provided on the inner wall of the through-hole of the sliding shoe Rubber mat is bonded with the slide bar.
Further, the laser lamp bead is set to towards the inside of the frame, the lamp bead switch towards the frame Outside.
Further, the quantity of the guide runner is two, is located at the left and right sides of the rear baffle.
Further, fixed connector, middle fixedly connected part and lower fixedly connected part are connecting plate, the connection Threaded hole is opened up on plate.
Further, the filter layer includes the first filter screen and the second filter screen, first filter screen and the second mistake Filter cotton layer, carbon fiber layer and textile fiber layers are set gradually between strainer.
The invention has the benefit that
The configuration of the present invention is simple, it is easy to use;Can be mobile by universal wheel, it is recorded convenient for being suitably positioned It broadcasts;The height of electronic whiteboard can be adjusted by driving motor, can be adjusted according to the height of user, improved and used The comfort level of person;Heat-conducting plate and radiating fin are set, heat dissipation effect is improved;Filter layer is set on front side of rear baffle, can be prevented Mosquito enters, and can also cross the dust in air filtering;Sliding shoe and laser lamp bead, the light that can be issued by laser lamp bead are set Line forms horizontal line on electronic whiteboard, can adjust the position of sliding shoe as needed, to form four line lattice, five line lattice etc., with side Just phonetic, English, music score etc. are write.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is the side structure schematic diagram of one embodiment of the present of invention;
Fig. 2 is the positive structure schematic at touch display screen;
Fig. 3 is the structural schematic diagram at sliding shoe;
Fig. 4 is the principle of the present invention block diagram.
Wherein:
1, frame;2, touch display screen;3, backboard;4, heat-conducting plate;5, radiating fin;6, rear baffle;7, heat dissipation cavity;8, mistake Filtering layer;9, controller;10, slide bar;11, sliding shoe;12, laser lamp bead;13, lamp bead switchs;14, battery;15, rubber pad;16, Drive block;17, threaded rod;18, upper bearing (metal);19, upper fixed seat;20, lower bearing;21, lower fixed seat;22, driving motor;23, Motor cabinet;24, guide runner;25, guide slide;26, support plate;27, case is supported;28, the first universal wheel;29, support frame; 30, camera;31, the second universal wheel;32, server.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
As shown in Figs 1-4, the teaching writing/playing system in the present embodiment, including electric whiteboard system, video recording system and service Device 32.
The electric whiteboard system includes the frame 1 of rectangle, and touch display screen 2, the touch are provided in the frame 1 It is provided with backboard 3 behind display screen 2, (schemes on the backboard 3 towards 2 side of touch display screen setting image sensor array In do not regard out);Heat-conducting plate 4 is arranged in the rear side of the backboard 3, and several radiating fins 5 are arranged in the rear side of the heat-conducting plate 4.It is described Rear baffle 6 is arranged in the rear side of frame 1, and heat dissipation cavity 7 is formed between the rear baffle 6 and the heat-conducting plate 4;The rear baffle 6 Front side is provided with filter layer 8;In the present embodiment, the filter layer 8 includes the first filter screen and the second filter screen, first mistake Filter cotton layer, carbon fiber layer and textile fiber layers are set gradually between strainer and the second filter screen.If being opened up on the rear baffle 6 Parch stomata (not regarding out in figure).
Controller 9 is set in the frame 1, the controller 9 respectively with the touch display screen 2 and image sensor battle array Column electrical connection.
It is provided with the slide bar 10 of vertical direction on front side of one munnion of the frame 1, is arranged on the slide bar 10 several Laser lamp bead 12 and lamp bead switch 13, the cunning can be set along the sliding shoe 11 of the slide bar 10 sliding, the sliding shoe 11 Battery 14 is set in motion block 11, and the battery 14 is electrically connected with the laser lamp bead 12 and lamp bead switch 13.In the present embodiment, institute The cross section for stating slide bar 10 is square;The sliding shoe 11 is cuboid, and the sliding shoe 11 is equipped with the through-hole of square, The slide bar 10 passes through the through-hole, and square can rotate to avoid sliding shoe 11 around slide bar 10;The through-hole of the sliding shoe 11 Inner wall on be provided with rubber pad 15, the rubber pad 15 is bonded with the slide bar 10, can to slide into sliding shoe 11 When suitable position, there can be enough frictional force and keep in the position.The laser lamp bead 12 is towards in the frame 1 Side, when laser lamp bead 12 shines, light is laterally extended along electronic whiteboard surface;The lamp bead switch 13 is set to described in The outside of frame 1, when adjustment sliding shoe 11 up and down, user holds with a hand the two sides up and down of sliding shoe 11, lamp bead switch 13 The side of setting will not influence adjustment.
The rear side of the rear baffle 6 is provided with a drive block 16, and the drive block 16 has the break-through of a vertical direction Screw hole, the drive block 16 are screwed on a threaded rod 17;The upper end of the threaded rod 17 is set in upper bearing (metal) 18, the upper axis It holds 18 to be set on upper fixed seat 19, fixed seat 19 is provided with fixedly connected part (not regarding out in figure);The threaded rod 17 lower end is arranged in lower bearing 20, and the lower bearing 20 is set on lower fixed seat 21, and the lower fixed seat 21 is provided with down Fixedly connected part (does not regard out) in figure;The lower end of the threaded rod 17 and the output axis connection of driving motor 22, the driving electricity Machine 22 is set on motor cabinet 23, and the motor cabinet 23 is connected with the lower fixed seat 21;The rear side of the rear baffle 6, which is provided with, leads To sliding block 24, the guide runner 24 is slidedly arranged on guide slide 25, and the guide slide 25 is provided with middle fixedly connected part (figure In do not regard out).In the present embodiment, the quantity of the guide runner 24 is two, is located at the left and right two of the rear baffle 6 Side.
Fixed connector, middle fixedly connected part and lower fixedly connected part are fixed in a support plate 26;The branch On support case 27, the lower section of the support case 27 is provided with the first universal wheel 28 for the lower section setting of fagging 26.
The video recording system includes support frame 29, and camera 30, support frame as described above 29 is arranged in the top of support frame as described above 29 Lower section be provided with the second universal wheel 31.
The server 32 is set in the support case 27;The server 32 respectively with the controller 9 and camera shooting First 30 communication connection.
In the present embodiment, fixed connector, middle fixedly connected part and lower fixedly connected part are connecting plate, the company Threaded hole is opened up on fishplate bar.Upper fixedly connected part, middle fixedly connected part and lower fixedly connected part are fixed on support by bolt On plate 26.
The present embodiment sets the two in use, electric whiteboard system and video recording system are pushed to suitable position Between distance, can start carry out recorded broadcast.The showing material being stored in server 32 is sent to touch by controller 9 and shows Display screen 2 is shown;When needing hand-written, induction pen is write in touch display screen 2, and induction nib can issue infrared light, images The infrared light that sensor array is issued by receiving induction pen, can identify fixation position of the induction pen in touch display screen 2, To be realized by controller 9 to the accurate measurement of induction pen handwriting trace, location Calculation.The heat of generation is transmitted by backboard 3 To heat-conducting plate 4, it is dispersed into heat dissipation cavity 7 through radiating fin 5, is discharged using air hole;Filter layer is set on front side of rear baffle 6 8, it can prevent mosquito from entering, the dust in air filtering can also be crossed.When needing to adjust the height of electronic whiteboard, starting driving Motor 22 drives threaded rod 17 to rotate, then drive block 16 can be moved along threaded rod 17 in vertical direction, realizes electronic whiteboard Height adjustment;In adjustment process, guide runner 24 slides into sliding along guiding, improves sliding stability.Sliding shoe 11 is set With laser lamp bead 12, horizontal line can be formed on electronic whiteboard by the light that laser lamp bead 12 issues, can adjusted as needed The position of sliding shoe 11 writes phonetic, English, music score etc. to facilitate, is not necessarily to artificial crossed to form four line lattice, five line lattice etc., It is very convenient.The collected curriculum video of camera 30 is sent to server 32 and is stored.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (6)

1. a kind of teaching writing/playing system, which is characterized in that including electric whiteboard system, video recording system and server;
The electric whiteboard system includes the frame of rectangle, and touch display screen, the touch display screen are provided in the frame It is provided with backboard below, image sensor array is set towards the touch display screen side on the backboard;After the backboard Heat-conducting plate is arranged in side, and several radiating fins are arranged in the rear side of the heat-conducting plate;
Rear baffle is arranged in the rear side of the frame, forms heat dissipation cavity between the rear baffle and the heat-conducting plate;The rear baffle Front side be provided with filter layer;Several air holes are opened up on the rear baffle;
Controller is set in the frame, and the controller is electrically connected with the touch display screen and image sensor array respectively It connects;
The slide bar of vertical direction is provided on front side of one munnion of the frame, be arranged on the slide bar it is several can be along the cunning Laser lamp bead and lamp bead switch are arranged on the sliding shoe, battery, the electricity is arranged in the sliding shoe for the sliding shoe of bar sliding Pond is electrically connected with the laser lamp bead and lamp bead switch;
A drive block is provided on rear side of the rear baffle, the drive block has the screw hole of the break-through of a vertical direction, described Drive block is screwed on a threaded rod;The upper end of the threaded rod is set in upper bearing (metal), and the upper bearing (metal) is set on upper fixed seat, Fixed seat is provided with fixedly connected part;The lower end of the threaded rod is arranged in lower bearing, and the lower bearing is set to On lower fixed seat, the lower fixed seat is provided with lower fixedly connected part;The lower end of the threaded rod and the output shaft of driving motor Connection, the driving motor are set on motor cabinet, and the motor cabinet is connected with the lower fixed seat;
Guide runner is provided on rear side of the rear baffle, the guide runner is slidedly arranged on guide slide, the guide slide It is provided with middle fixedly connected part;
Fixed connector, middle fixedly connected part and lower fixedly connected part are fixed in a support plate;The support plate Lower section setting is provided with the first universal wheel below the support case on support case;
The video recording system includes support frame, and the top of support frame as described above is arranged camera, is provided with below support frame as described above Second universal wheel;
The server is set in the support case;The server is communicated to connect with the controller and camera respectively.
2. a kind of teaching writing/playing system as described in claim 1, which is characterized in that the cross section of the slide bar is square; The sliding shoe is cuboid, and the sliding shoe is equipped with the through-hole of square, and the slide bar passes through the through-hole;The sliding Rubber pad is provided on the inner wall of the through-hole of block, the rubber pad is bonded with the slide bar.
3. a kind of teaching writing/playing system as claimed in claim 2, which is characterized in that the laser lamp bead is towards the frame Inside, the lamp bead switch are set to towards the outside of the frame.
4. a kind of teaching writing/playing system as claimed in claim 3, which is characterized in that the quantity of the guide runner is two, It is located at the left and right sides of the rear baffle.
5. a kind of teaching writing/playing system as claimed in claim 4, which is characterized in that fixed connector, middle fixation are even Fitting and lower fixedly connected part are connecting plate, open up threaded hole on the connecting plate.
6. a kind of teaching writing/playing system as claimed in claim 5, which is characterized in that the filter layer include the first filter screen and Second filter screen sets gradually filter cotton layer, carbon fiber layer and fabric fibre between first filter screen and the second filter screen Layer.
CN201811244625.7A 2018-10-24 2018-10-24 Teaching writing/playing system Pending CN109360452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811244625.7A CN109360452A (en) 2018-10-24 2018-10-24 Teaching writing/playing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811244625.7A CN109360452A (en) 2018-10-24 2018-10-24 Teaching writing/playing system

Publications (1)

Publication Number Publication Date
CN109360452A true CN109360452A (en) 2019-02-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811244625.7A Pending CN109360452A (en) 2018-10-24 2018-10-24 Teaching writing/playing system

Country Status (1)

Country Link
CN (1) CN109360452A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113034990A (en) * 2021-02-25 2021-06-25 许昌学院 A record device in class a little for english teaching

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KR20060085058A (en) * 2005-01-21 2006-07-26 엘지전자 주식회사 Plasma display apparatus
KR101494856B1 (en) * 2013-09-11 2015-02-23 주식회사 프라이머스코즈 A LCD Installation Frame for the Bus Shelter
CN204360642U (en) * 2015-01-18 2015-05-27 李坤 English teaching laser demarcation device
CN204926572U (en) * 2015-09-02 2015-12-30 汤钊濠 System for be used for recording online teaching video
CN206340189U (en) * 2016-11-16 2017-07-18 天津恒智星科技有限公司 A kind of interactive multifunctional electronic whiteboard
CN206524046U (en) * 2016-12-19 2017-09-26 郑艳艳 One kind teaching lattice instrument of four line three
CN207038058U (en) * 2017-07-10 2018-02-23 深圳蓝图信息技术股份有限公司 A kind of solid shop/brick and mortar store intelligent advisement player
CN207216492U (en) * 2017-08-10 2018-04-10 苏州苏彩信息技术有限公司 A kind of intelligent interactive electronic white plate
CN108001088A (en) * 2017-12-29 2018-05-08 漳浦县建金智能科技有限公司 A kind of virtual line-plotting device of laser
CN108257425A (en) * 2018-01-08 2018-07-06 四川省达县职业高级中学 One kind automatically controls demonstrator
CN207637129U (en) * 2018-01-09 2018-07-20 广东三嘉教育装备有限公司 Synchronous electronic whiteboard
CN207744311U (en) * 2017-12-28 2018-08-17 东莞市富其扬电子科技有限公司 A kind of cooling fin that can filter air plankton
CN207808860U (en) * 2017-12-29 2018-09-04 漳浦县建金智能科技有限公司 A kind of virtual line-plotting device of laser

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060085058A (en) * 2005-01-21 2006-07-26 엘지전자 주식회사 Plasma display apparatus
KR101494856B1 (en) * 2013-09-11 2015-02-23 주식회사 프라이머스코즈 A LCD Installation Frame for the Bus Shelter
CN204360642U (en) * 2015-01-18 2015-05-27 李坤 English teaching laser demarcation device
CN204926572U (en) * 2015-09-02 2015-12-30 汤钊濠 System for be used for recording online teaching video
CN206340189U (en) * 2016-11-16 2017-07-18 天津恒智星科技有限公司 A kind of interactive multifunctional electronic whiteboard
CN206524046U (en) * 2016-12-19 2017-09-26 郑艳艳 One kind teaching lattice instrument of four line three
CN207038058U (en) * 2017-07-10 2018-02-23 深圳蓝图信息技术股份有限公司 A kind of solid shop/brick and mortar store intelligent advisement player
CN207216492U (en) * 2017-08-10 2018-04-10 苏州苏彩信息技术有限公司 A kind of intelligent interactive electronic white plate
CN207744311U (en) * 2017-12-28 2018-08-17 东莞市富其扬电子科技有限公司 A kind of cooling fin that can filter air plankton
CN108001088A (en) * 2017-12-29 2018-05-08 漳浦县建金智能科技有限公司 A kind of virtual line-plotting device of laser
CN207808860U (en) * 2017-12-29 2018-09-04 漳浦县建金智能科技有限公司 A kind of virtual line-plotting device of laser
CN108257425A (en) * 2018-01-08 2018-07-06 四川省达县职业高级中学 One kind automatically controls demonstrator
CN207637129U (en) * 2018-01-09 2018-07-20 广东三嘉教育装备有限公司 Synchronous electronic whiteboard

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113034990A (en) * 2021-02-25 2021-06-25 许昌学院 A record device in class a little for english teaching

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Application publication date: 20190219

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