CN108274928A - A kind of open air blackboard - Google Patents
A kind of open air blackboard Download PDFInfo
- Publication number
- CN108274928A CN108274928A CN201810227046.5A CN201810227046A CN108274928A CN 108274928 A CN108274928 A CN 108274928A CN 201810227046 A CN201810227046 A CN 201810227046A CN 108274928 A CN108274928 A CN 108274928A
- Authority
- CN
- China
- Prior art keywords
- board
- writes
- frame
- blackboard
- plate framework
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
- B43L1/04—Blackboards
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B97/00—Furniture or accessories for furniture, not provided for in other groups of this subclass
- A47B97/04—Easels or stands for blackboards or the like
- A47B97/08—Easels or stands for blackboards or the like foldable
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
It includes write plate framework, supporting rack that the present invention, which provides a kind of, supporting rack includes two supporting rods, two supporting rods are articulated with board base of frame, write plate framework lower section be equipped with supporting rod storage tank, the plate framework that writes is interior to be equipped with the first track and the second track, the first board is equipped in first track, the second board is equipped in second track, the length of first board and the second board is identical as the length of plate framework of writing, the width of the first board and the second board be write plate framework width half；First board and the second board include substrate and panel, substrate to have fluorescent material, panel with the coated on one side of plate contact be glass plate.The present invention can also be shone by being coated with fluorescent powder on the substrate of board in pitch-dark environment, write and covered luminous part in word, the picture etc. on glass plate, making one can be clearly recognizable；Supporting rod is collapsible into supporting rod storage tank, reduces occupied space.
Description
Technical field
The present invention relates to teaching aid, specifically a kind of outdoor blackboard.
Background technology
In order to implement and implement party's policy for education comprehensively, culture adapts to the comprehensive talent that modernized society needs；In order to
Student Ideology moral construction is further strengthened and improved, students is allowed to come into society, gets close to society, understands society, concern society；
For open student's outlook, the overall qualities of student itself, the manipulative ability of training student and team collaboration's spirit are improved, it is at different levels
Various kinds of schools has carried out various informative various social practices.Carry out social practice, is comprehensive training student innovation essence
God, the ability of practice and overall qualities important measure, and overcome " exam-oriented education " be inclined to, In Carrying Out All-round Education it is important
Content.Carry out social practice, allow student to move towards society, touch society, be socially reintegrated, understanding society is gone to knowledge
Meeting, the culture for the initiative spirit and spirit of exploration and the ability of practice of student provide chance, promote school eduaction with outside school
Education is combined, and education is combined with productive labor and social practice.By carrying out colourful social practice extensively,
The physique of student is allowed to be taken exercise, esthetic sentiment is moulded, and attitude to labour and labour skill are enhanced, and student
The exercise that the progress inwardly and will and character obtained in practice is subject to, and move to scientific and cultural knowledge in study,
The development of student's physical and mental health is advantageously facilitated.Social practice is different from classroom instruction, but is not explain, social practice
It also needs to explain, when explanation will use blackboard often, and existing blackboard is fixed, it has not been convenient to be carried, there is presently no special
Door cannot be satisfied social practice needs for outdoor blackboard for education.
Existing blackboard generally can only all use indoors, but under certain Outdoor Scenes, also need blackboard.
And if existing blackboard will use outdoors, can only use mode of turning on light, asking in this way and there are lamp source power supply
Topic, if installing power supply on blackboard, considerably increases the weight of blackboard again.
Invention content
In view of this, the purpose of the present invention is to provide a kind of adjustable writing height, nights it is not necessary that turn on light also can be normal
The outdoor blackboard used.
To achieve the goals above, the technical solution adopted by the present invention is：A kind of open air blackboard, including the plate framework that writes,
Supporting rack, support frame as described above include two supporting rods, and two supporting rods are articulated with board base of frame, described to write under plate framework
Side is equipped with supporting rod storage tank, and the inboard, upright of the plate framework that writes is provided with opposite the first track and the second track, institute
It states and is equipped with the first board in the first track, the second board, first board and second are equipped in second track
The length of board is identical as the length for the plate framework that writes, and the width of first board and the second board is to write
The half of the width of plate framework；
First board and the second board include substrate and panel, the coated on one side with plate contact of the substrate
It is glass plate to have fluorescent material, the panel.
Further, further include blackboard eraser, the blackboard eraser includes shell and cleaning wiping cloth, and magnet is equipped in the shell,
Magnetic powder is uniformly filled in the substrate.
Further, further include writing pen, the writing pen includes pen cap and pen container, and the both ends of the pen container are respectively equipped with
The length direction of nib and public address set, the pen container upper edge pen container is equipped with wiper rail, and the luminal perfusion of the pen container has ink,
One end of the nib is inserted into pen container inner cavity, and the pen cap is sheathed on outside nib and is connect with pen container.
Further, the nib includes sliver and plastic protective sleeve, and the plastic protective sleeve is sheathed on outside sliver.
Further, magnetic protection set is also arranged with outside the pen container, the magnetic protection set is equipped with along its length to be used
In the notch of accommodating wiper rail.
Further, the supporting rod includes telescopic rod, and the telescopic rod includes outer tube and the inner tube that is arranged in outer tube,
The outer wall of said inner tube is equipped with more than two shrapnels along short transverse, and the outer tube is equipped with the through-hole being adapted to shrapnel.
Further, the bottom of the supporting rod be equipped with A-frame, the A-frame include turntable, the first stabilizer blade,
Second stabilizer blade and third stabilizer blade, first stabilizer blade, the second stabilizer blade and third stabilizer blade are fixed on turntable, and the turntable is articulated with
The bottom of supporting rod.
Further, it is additionally provided with fixed frame at the top of the plate framework that writes, shaft is rotatablely equipped on the fixed frame,
Circumvolution has projection screen 3, the exposed one end of the curtain to be mounted on and shaft fixed plate disposed in parallel in the shaft
On, the lifting assembly for curtain described in Automatic-expanding is installed between the fixed frame and the fixed plate.
Further, the back side of the plate framework that writes is equipped with shoulder strap.
The key ideas of above-mentioned technical proposal one is：By being coated with fluorescent powder on the substrate of board, pitch-dark
It can also shine in environment, write and cover luminous part in word, the picture etc. on glass plate, making one can be clearly recognizable.
The advantageous effect of above-mentioned technical proposal is：By being coated with fluorescent powder on the substrate of board, in pitch-dark environment
In can also shine, write and in word, the picture etc. on glass plate cover luminous part, making one can be clearly recognizable；Supporting rod can
It folds into supporting rod storage tank, reduces occupied space；The height of first board and the second board is adjustable, is placed on and writes
The lower half portion of plate framework is positioned over the working part for the plate framework that writes convenient for displaying convenient for writing after writing.
Description of the drawings
Fig. 1 show the structural schematic diagram of outdoor blackboard of the invention.
Fig. 2 show outdoor first board of blackboard or the structural schematic diagram of the second board of the invention.
Fig. 3 show the supporting rack unfolded state schematic diagram of outdoor blackboard of the invention.
Fig. 4 show the supporting rack collapsed state schematic diagram of outdoor blackboard of the invention.
Drawing reference numeral explanation：
1- writes plate framework；The first boards of 11-；The second boards of 12-；111- substrates；112- panels；113- fluorescent materials；
The first tracks of 13-；The second tracks of 14-；21- supporting rods；211- outer tubes；212- inner tubes；213- shrapnels；22- supporting rod storage tanks；
23- A-frames；231- turntables；The first stabilizer blades of 232-；The second stabilizer blades of 233-；234- third stabilizer blades；3- projection screens.
Specific implementation mode
It is as follows that the present invention is described further in the following with reference to the drawings and specific embodiments：
As Figure 1-Figure 4, a kind of outdoor blackboard provided by the invention, including write plate framework 1, supporting rack, support frame as described above
Including two supporting rods 21, two supporting rods are articulated with board base of frame, and the lower section of the plate framework that writes holds equipped with supporting rod
Slot 22 is set, the inboard, upright of the plate framework that writes is provided with opposite the first track 13 and the second track 14, first rail
It is equipped with the first board 11 in road, is equipped with the second board 12 in second track, first board and second writes
The length of plate is identical as the length for the plate framework that writes, and the width of first board and the second board is the sheet frame that writes
The half of the width of frame；
First board and the second board include substrate 111 and panel 112, one with plate contact of the substrate
Face is coated with fluorescent material 113, and the panel is glass plate.
Specifically, working principle of the present invention is as follows：By being coated with fluorescent powder on the substrate of board, in pitch-dark ring
It can also shine in border, write and cover luminous part in word, the picture etc. on glass plate, making one can be clearly recognizable.
When outdoor blackboard does not use, two supporting rods can be folded inward, be received into supporting rod storage tank, need
Supporting rod is opened when use again, the plate framework that will write is rested on tree or wall and can be write.
Alternatively, support base can also be arranged in the bottom of supporting rod, it is arranged in the bottom for the plate framework that writes uses accordingly
In the groove of accommodating support base, thus it is not necessarily to find the fulcrum leaned on, it only can with two supporting rods and support base
It is firm to place outdoor blackboard.
Since the inside for the plate framework that writes is equipped with the first track and the second track, write equipped with first in first track
Plate, is equipped with the second board in second track, and the width of the first board and the second board is the plate framework that writes
The half of width so that the height of the first board and the second board is adjustable, by the first board or the when needing to write
Two boards move the lower half portion for the plate framework that writes to.And the first board or the second board write, it shifts onto and writes
The top half of letter stencil frame.The first board or the second board being located above in order to prevent are fallen, and can write
Magnet is arranged in the top of plate framework, while corresponding position is also provided with magnet on the first board and the second board, you can ensures
First board or the second board are not fallen.
As can be seen from the above description, the invention has the advantages that：By being coated with fluorescent powder on the substrate of board,
It can also shine in pitch-dark environment, write and cover luminous part in word, the picture etc. on glass plate, make one to understand and distinguish
Recognize；Supporting rod is collapsible into supporting rod storage tank, reduces occupied space；The height of first board and the second board can
It adjusts, is placed on the lower half portion for the plate framework that writes convenient for writing, the working part that the plate framework that writes is positioned over after writing is convenient for
Displaying.
In the above-described embodiments, further include blackboard eraser, the blackboard eraser includes shell and cleaning wiping cloth, is equipped in the shell
Magnet is uniformly filled with magnetic powder in the substrate so that blackboard eraser can be attracted on the first board or the second board, be kept away
It omits and falls.
In the above-described embodiments, further include writing pen, the writing pen includes pen cap and pen container, the both ends point of the pen container
Not She You nib and public address set, the length direction of the pen container upper edge pen container is equipped with wiper rail, the luminal perfusion of the pen container
There are ink, one end of the nib to be inserted into pen container inner cavity, the pen cap is sheathed on outside nib and is connect with pen container.This writes
Pen pulls up pen cap and can be carried out writing, and opening the switch of public address set can allow sound to pass farther, play the work of loud speaker
With without in addition wearing " apis florea ".At the same time, the length direction of pen container upper edge pen container is equipped with wiper rail, can prevent from looking for
For wiping writing when less than blackboard eraser.
In the above-described embodiments, the nib includes sliver and plastic protective sleeve, and the plastic protective sleeve is sheathed on sliver
Outside.One end of sliver is dipped in ink, can smoothly be write after fully absorbing prepared Chinese ink, and plastic protective sleeve can prevent sliver from deforming,
Contraction is played to sliver.
In the above-described embodiments, also it is arranged with magnetic protection set outside the pen container（It can be in plastics or rubber material
It is stained with magnet in shell, magnetic protection set is made）, the magnetic protection set is along its length equipped with for housing lacking for wiper rail
Mouthful so that can be adsorbed on board after magnetic protection set on Writing pen sleeve, reserve for house the notch of wiper rail from
Board is wiped without influence wiper rail, without removing magnetic protection set.
In the above-described embodiments, the supporting rod 21 includes telescopic rod, and the telescopic rod includes outer tube 211 and is arranged in outer
Inner tube 212 in pipe, the outer wall of said inner tube are equipped with more than two shrapnels 213 along short transverse, the outer tube be equipped with
The through-hole of shrapnel adaptation.Outer tube and inner tube press shrapnel into through-hole by the mating connection of shrapnel and through-hole, you can from height
Outer tube or inner tube are moved in direction, and shrapnel is pierced by out of another through-hole of the place height when being adjusted to proper height so that outdoor blackboard
It can be according to the height of the height adjustable telescopic rod of user, convenient for writing.
In the above-described embodiments, the bottom of the supporting rod is equipped with A-frame 23, and the A-frame includes turntable
231, the first stabilizer blade 232, the second stabilizer blade 233 and third stabilizer blade 234, first stabilizer blade, the second stabilizer blade and third stabilizer blade are fixed
In on turntable, the turntable is articulated with the bottom of supporting rod.The supporting rod of the structure, which can consolidate, is supported in ground, especially soil
In, three stabilizer blades can be plugged into soil, be not easy to rock.
In the above-described embodiments, it is additionally provided with fixed frame at the top of the plate framework that writes, is rotatablely installed on the fixed frame
Have a shaft, in the shaft circumvolution there is projection screen 3, the exposed one end of the curtain to be mounted on disposed in parallel with the shaft
In fixed plate, the lifting assembly for curtain described in Automatic-expanding is installed between the fixed frame and the fixed plate.It is described
Lifting assembly includes the rack for being located at installation parallel with the shaft on the fixed frame, along the shaft on the fixed frame
It slides axially and two liters of curtain motors is installed, the tooth being meshed with the rack is installed on two motor shafts for rising curtain motor
It takes turns, link block is rotatablely equipped on the motor shaft for rising curtain motor；It is axially arranged with cunning along the shaft in the fixed plate
Slot；The lifting assembly further includes scissor-type lifting mechanism, and the scissor-type lifting mechanism is located at the both ends sliding peace of one end
In the sliding slot, the both ends that the scissor-type lifting mechanism is located at the other end are respectively hinged on two link blocks.
Above structure makes outdoor blackboard that can be projected, and projection screen is passed through fixed frame, fixed plate and lifting assembly when needing
Cooperation expansion, projection screen is occupied little space by circumvolution to shaft when not used, will not obstruct the view.
In the above-described embodiments, the back side of the plate framework that writes is equipped with shoulder strap so that the open air blackboard is easy to carry.
Below be the embodiment of the present invention, with help those skilled in the art be better understood from the present invention technology contents with
And the technical contribution that the present invention is made compared with the existing technology：
Embodiment
Fig. 1 to Fig. 4, a kind of open air blackboard are please referred to, including write plate framework 1, supporting rack, support frame as described above include two
Strut 21, two supporting rods are articulated with board base of frame, and the lower section of the plate framework that writes is equipped with supporting rod storage tank 22, institute
The inboard, upright for stating the plate framework that writes is provided with opposite the first track 13 and the second track 14, and the is equipped in first track
One board 11, is equipped with the second board 12 in second track, and the length of first board and the second board is equal
Identical as the length for the plate framework that writes, the width of first board and the second board is the width of plate framework of writing
Half；First board and the second board include substrate 111 and panel 112, the substrate with plate contact
It is glass plate that coated on one side, which has fluorescent material 113, the panel,.Further include blackboard eraser, the blackboard eraser includes shell and wiping
Cloth, the shell is interior to be equipped with magnet, and magnetic powder is uniformly filled in the substrate.Further include writing pen, the writing pen includes pen
The both ends of cap and pen container, the pen container are respectively equipped with nib and public address set, the length direction of the pen container upper edge pen container are equipped with
The luminal perfusion of wiper rail, the pen container has ink, one end of the nib to be inserted into pen container inner cavity, and the pen cap is sheathed on
It is connect outside written and with pen container.The nib includes sliver and plastic protective sleeve, and the plastic protective sleeve is sheathed on outside sliver.Institute
It states and is also arranged with magnetic protection set outside pen container, the magnetic protection set is equipped with the notch for housing wiper rail along its length.
The supporting rod includes telescopic rod, and the telescopic rod includes outer tube 211 and the inner tube 212 that is arranged in outer tube, said inner tube
Outer wall is equipped with more than two shrapnels 213 along short transverse, and the outer tube is equipped with the through-hole being adapted to shrapnel.The supporting rod
Bottom be equipped with A-frame 23, the A-frame includes turntable 231, the first stabilizer blade 232, the second stabilizer blade 233 and third branch
Foot 234, first stabilizer blade, the second stabilizer blade and third stabilizer blade are fixed on turntable, and the turntable is articulated with the bottom of supporting rod.
Be additionally provided with fixed frame at the top of the plate framework that writes, shaft be rotatablely equipped on the fixed frame, in the shaft circumvolution have
Projection screen 3, the exposed one end of the curtain be mounted on in shaft fixed plate disposed in parallel, the fixed frame and institute
State the lifting assembly being equipped between fixed plate for curtain described in Automatic-expanding.The back side of the plate framework that writes is equipped with the back of the body
Band.
The advantageous effect of the embodiment is：By being coated with fluorescent powder on the substrate of board, in pitch-dark environment
Also it can shine, write and cover luminous part in word, the picture etc. on glass plate, making one can be clearly recognizable；Supporting rod can be rolled over
It is laminated in supporting rod storage tank, reduces occupied space；The height of first board and the second board is adjustable, is placed on board
The lower half portion of frame is positioned over the working part for the plate framework that writes convenient for displaying convenient for writing after writing；It blackboard eraser and writes
Word pen is adsorbed on by magnetisable material on board of the substrate filled with magnetic powder, not easy to lose, can be taken at any time.
The present invention is described by above-mentioned related embodiment and attached drawing, however above-described embodiment is only to implement the present invention's
Example.It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, being included in claim
The modification of spirit and scope and impartial setting are included in the scope of the present invention.
Claims (9)
1. a kind of open air blackboard, it is characterised in that：Including the plate framework that writes, supporting rack, support frame as described above includes two supporting rods, and two
Supporting rod is articulated with board base of frame, and the lower section of the plate framework that writes is equipped with supporting rod storage tank, the sheet frame that writes
The inboard, upright of frame is provided with opposite the first track and the second track, and the first board is equipped in first track, described
It is equipped with the second board in second track, the length of the length of first board and the second board with the plate framework that writes
It is identical, the width of first board and the second board be write plate framework width half；
First board and the second board include substrate and panel, the coated on one side with plate contact of the substrate
It is glass plate to have fluorescent material, the panel.
2. open air blackboard according to claim 1, it is characterised in that：Further include blackboard eraser, the blackboard eraser includes shell
And cleaning wiping cloth, the shell is interior to be equipped with magnet, and magnetic powder is uniformly filled in the substrate.
3. open air blackboard according to claim 1, it is characterised in that：Further include writing pen, the writing pen includes pen cap
And pen container, the both ends of the pen container are respectively equipped with nib and public address set, the length direction of the pen container upper edge pen container, which is equipped with, to be wiped
Item is wiped, the luminal perfusion of the pen container has ink, one end of the nib to be inserted into pen container inner cavity, and the pen cap is sheathed on pen
Head is outer and is connect with pen container.
4. open air blackboard according to claim 3, it is characterised in that：The nib includes sliver and plastic protective sleeve, institute
Plastic protective sleeve is stated to be sheathed on outside sliver.
5. open air blackboard according to claim 3, it is characterised in that：It is also arranged with magnetic protection set, institute outside the pen container
Magnetic protection set is stated along its length equipped with the notch for housing wiper rail.
6. open air blackboard according to claim 1, it is characterised in that：The supporting rod includes telescopic rod, the telescopic rod
Including outer tube and the inner tube being arranged in outer tube, the outer wall of said inner tube is equipped with more than two shrapnels along short transverse, described
Outer tube is equipped with the through-hole being adapted to shrapnel.
7. open air blackboard according to claim 1, it is characterised in that：The bottom of the supporting rod is equipped with A-frame, institute
It includes turntable, the first stabilizer blade, the second stabilizer blade and third stabilizer blade, first stabilizer blade, the second stabilizer blade and third branch to state A-frame
Foot is fixed on turntable, and the turntable is articulated with the bottom of supporting rod.
8. open air blackboard according to claim 1, it is characterised in that：It is additionally provided with fixation at the top of the plate framework that writes
Frame is rotatablely equipped with shaft on the fixed frame, in the shaft circumvolution have projection screen, the exposed one end installation of the curtain
With in shaft fixed plate disposed in parallel, it is equipped between the fixed frame and the fixed plate for Automatic-expanding institute
State the lifting assembly of curtain.
9. open air blackboard according to claim 1, it is characterised in that：The back side of the plate framework that writes is equipped with shoulder strap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810227046.5A CN108274928A (en) | 2018-03-20 | 2018-03-20 | A kind of open air blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810227046.5A CN108274928A (en) | 2018-03-20 | 2018-03-20 | A kind of open air blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108274928A true CN108274928A (en) | 2018-07-13 |
Family
ID=62809989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810227046.5A Pending CN108274928A (en) | 2018-03-20 | 2018-03-20 | A kind of open air blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108274928A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109130611A (en) * | 2018-09-13 | 2019-01-04 | 安徽倍思特教育科技有限公司 | A kind of primary school education teaching auxiliary device and its operating process |
| CN111662534A (en) * | 2020-06-22 | 2020-09-15 | 河南牧业经济学院 | Production method of high-strength luminous magnetic blackboard |
| CN113314004A (en) * | 2021-06-22 | 2021-08-27 | 华南农业大学 | Outdoor nature education is with teaching board |
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| CN205789005U (en) * | 2016-07-07 | 2016-12-07 | 河南工业职业技术学院 | A kind of ideological and political propaganda hurdle |
| CN205903058U (en) * | 2016-06-14 | 2017-01-25 | 宁波大学 | Environmental protection blackboard is used in english teaching of adjustable height |
| CN206317587U (en) * | 2016-11-22 | 2017-07-11 | 刘丽帆 | A kind of multifunctional blackboard eraser |
| CN107443972A (en) * | 2017-08-08 | 2017-12-08 | 安徽状元郎电子科技有限公司 | A kind of classroom interaction blackboard |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102848814A (en) * | 2012-09-03 | 2013-01-02 | 昆山市奋发绝缘材料有限公司 | Multifunctional blackboard |
| CN204398618U (en) * | 2014-12-31 | 2015-06-17 | 上海市闸北区中小学科技指导站 | A kind of segmented Teaching pen |
| CN205086542U (en) * | 2015-10-22 | 2016-03-16 | 代玉敏 | Portable multifunctional blackboard |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109130611A (en) * | 2018-09-13 | 2019-01-04 | 安徽倍思特教育科技有限公司 | A kind of primary school education teaching auxiliary device and its operating process |
| CN109130611B (en) * | 2018-09-13 | 2021-03-19 | 安徽倍思特教育科技有限公司 | Primary school education and teaching auxiliary device and operation flow thereof |
| CN111662534A (en) * | 2020-06-22 | 2020-09-15 | 河南牧业经济学院 | Production method of high-strength luminous magnetic blackboard |
| CN111662534B (en) * | 2020-06-22 | 2023-01-24 | 河南牧业经济学院 | Production method of high-strength luminous magnetic blackboard |
| CN113314004A (en) * | 2021-06-22 | 2021-08-27 | 华南农业大学 | Outdoor nature education is with teaching board |
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Application publication date: 20180713 |