NL2023956B1 - Teaching Device Based on Memory Improvement - Google Patents

Teaching Device Based on Memory Improvement Download PDF

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Publication number
NL2023956B1
NL2023956B1 NL2023956A NL2023956A NL2023956B1 NL 2023956 B1 NL2023956 B1 NL 2023956B1 NL 2023956 A NL2023956 A NL 2023956A NL 2023956 A NL2023956 A NL 2023956A NL 2023956 B1 NL2023956 B1 NL 2023956B1
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NL
Netherlands
Prior art keywords
embedded
base
rod
support rod
telescopic support
Prior art date
Application number
NL2023956A
Other languages
Dutch (nl)
Inventor
Yao Jianyong
Original Assignee
Shanghai Taixiong Education Equipment Group 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.)
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Publication date
Application filed by Shanghai Taixiong Education Equipment Group Co Ltd filed Critical Shanghai Taixiong Education Equipment Group Co Ltd
Application granted granted Critical
Publication of NL2023956B1 publication Critical patent/NL2023956B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/043—Allowing translations
    • F16M11/046—Allowing translations adapted to upward-downward translation movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/16—Details concerning attachment of head-supporting legs, with or without actuation of locking members thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/42—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters with arrangement for propelling the support stands on wheels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00—Electrically-operated educational appliances
    • G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M2200/00—Details of stands or supports
    • F16M2200/02—Locking means
    • F16M2200/025—Locking means for translational movement
    • F16M2200/028—Locking means for translational movement by positive interaction, e.g. male-female connections

Abstract

The invention provides a teaching device based on memory improvement, comprising a magnetic explanation board, a telescopic supporting rod and a base, wherein, the telescopic supporting rod is fixed at the bottom of the magnetic explanation board, an embedded rod is embedded in the telescopic supporting rod, an adjusting handle is fixed at one side of the top of the embedded rod, a locating hole is fixed at the surface of the embedded rod, a locating bolt is embedded in the other side of the telescopic supporting rod, a cushion is fixed at the internal bottom of the telescopic supporting rod, and a moving groove is nested at the bottom of the telescopic supporting rod. The moving groove improves the flexibility of the device body, the reinforced suction cup improves the stability of the device body, the explanation board protection frame has a protective effect on the explanation board, the writing tool groove improves the convenience of the device body, the fixable moving mechanism improves the practicability of the device body, and the detachable telescoping mechanism saves the space of the device body. It applies to teaching devices, and enjoys a wide development prospect in the future.

Description

Teaching Device Based on Memory Improvement Technical Field The invention relates to the technical field of teaching devices, in particular to a teaching device based on memory improvement.
Background Education is one of the most important things that people concern. The quality of education is crucial to China's modernization construction, and also plays a kev role in individual development. So parents pay special attention to the quality of their children's education.
The existing teaching board is not portable. If wanting to move it, teachers need to lift the whole teaching board up with their hands. Such a movement will not only add additional burdens to teachers’ teaching work, but may also cause damages to the teaching board during moving. The existing teaching devices occupy a large space and most just face to one direction, resulting in usage limitation.
As a result, how to design a teaching device based on memory improvement becomes a problem that desperately needs to be solved. Summary of the Invention The invention aims to provide a teaching device based on memory improvement, in order to solve the problems of low portability and certain limitation during usage as presented in the background above.
In order to achieve the above-mentioned purpose, the invention provides the following technical solution: a teaching device based on memory improvement, comprising a magnetic explanation board, a telescopic supporting rod and a base; wherein, the telescopic supporting rod is fixed at the bottom of the magnetic explanation board, an embedded rod is embedded in the telescopic supporting rod, an adjusting handle is fixed at one side of the top of the embedded rod. a locating hole is fixed at the surface of the embedded rod, a locating bolt is embedded in the other side of the telescopic supporting rod, a cushion is fixed at the internal bottom of the telescopic supporting rod, a moving groove is nested at the bottom of the telescopic supporting rod, an elastic mounting block is fixed at one side of the moving groove, a base is fixed at the bottom of the moving groove, a mounting groove is fixed in the middle of the base, a balance block is fixed in the base, a fixing block is fixed at one side of the bottom of the base, a fixing hole is fixed at the surface of the fixing block, an elastic brake plate is fixed at the bottom of the fixing block, an universal wheel is fixed at the bottom of the elastic brake plate. and a locating bolt is embedded in the other side of the top of the universal wheel; an explanation board protection frame is fixed at the outer wall of the magnetic explanation board; a writing tool groove is fixed at one side of the bottom of the explanation board protection frame.
Compared with the existing technology. the invention has the following beneficial effects:
1. In the teaching device based on memory improvement, the fixable moving mechanism is provided. Teachers can move the teaching board by means of universal wheels. They can press the elastic brake plate down in close contact with the universal wheel after moving the teaching board to a designated position, and insert the locating bolt into the fixing hole to fix the elastic brake plate, preventing the teaching board from moving during teaching, and improving the stability of the device.
2. In the teaching device based on memory improvement, the detachable telescoping mechanism is provided. The surface of the magnetic explanation board is magnetic so that teachers can attach the teaching flashcards to the magnetic explanation board. The magnetic explanation board is fixed in the moving groove, and moving steel balls are provided in the moving groove, so that the magnetic explanation board can rotate. When the device is idle, the detachable telescoping mechanism and the mechanisms above can be dismantled, saving storage space.
Brief Descriptions of the Drawings FIG.1 is the overall view of the invention; FIG.2 is the sectional view of the base in B-B direction: FIG.3 1s the sectional view of the telescopic supporting rod in B-B direction: FIG.4 is the enlarged view of Point A of the invention. Detailed Descriptions of the Preferred Embodiments Referring to FIG. 1-4, the invention provides a technical solution: a teaching device based on memory improvement, comprising a magnetic explanation board 1, a telescopic supporting rod 4 and a base 6; wherein, the telescopic supporting rod 4 is fixed at the bottom of the magnetic explanation board 1, an embedded rod 15 is embedded in the telescopic supporting rod 4, an adjusting handle 16 is fixed at one side of the top of the embedded rod 15, a locating hole 17 is fixed at the surface of the embedded rod 15, a locating bolt 14 is embedded in the other side of the telescopic supporting rod 4, a cushion 18 is fixed at the internal bottom of the telescopic supporting rod 4, a moving groove 19 is nested at the bottom of the telescopic supporting rod 4, an elastic mounting block 20 is fixed at one side of the moving groove 19, a base 6 is fixed at the bottom of the moving groove 19, a mounting groove 21 is fixed in the middle of the base 6, a balance block 7 is fixed in the base 6, a fixing block 8 is fixed at one side of the bottom of the base 6, a fixing hole 9 is fixed at the surface of the fixing block 8, an elastic brake plate 10 is fixed at the bottom of the fixing block 8, an universal wheel 12 1s fixed at the bottom of the elastic brake plate 10, and a locating bolt 11 is embedded in the other side of the top of the universal wheel 12.
Preferably, an explanation board protection frame 2 is fixed at the outer wall of the magnetic explanation board 1. The teaching board of the existing teaching devices is easy to damage due to collisions. The explanation board protection frame 2 is provided. The outer wall of the magnetic explanation board 1 is covered by the explanation board protection frame 2. When teachers cause the teaching board to collide against other objects unintentionally, the explanation board protection frame 2 can work as a buffer to prevent the magnetic explanation board 1 from being damaged.
Preferably, a writing tool groove 3 is fixed at one side of the bottom of the explanation board protection frame 2. Teachers usually write notes with a writing pen for students to strengthen their memory in class. However, no writing tool storages are provided for most of the existing teaching boards. The writing tool groove 3 is provided. The teachers can directly put writing pens in the writing tool groove 3 when the writing pens are not required during teaching, rather than holding the writing pen in hand all the time.
Preferably, reinforced suction cups 13 are fixed at the bottom of the base 6. The existing teaching board is poor in stability. It is easy to turn over during teaching, bringing unnecessary troubles and affecting the working efficiency of teachers. The reinforced suction cups 13 are provided. When using the teaching board, teachers can fix the teaching board on the ground by means of reinforced suction cups 13, preventing the teaching board from turning over.
Preferably. a book storage box 5 is fixed at the other side of the top of the base 6. Teachers usually need to use some related books before teaching. In the prior art, teachers have to carry the book with their hands all the time. It would be impossible for them to carry if there are too many books. The book storage box 5 is provided. Teachers can put all teaching-related books in the book storage box 5 without having to carry them around, embodying the convenience of the book storage box5.
Preferably, the fixable moving mechanism comprises a balance block 7 in the base 6, a fixing block 8 at one side of the bottom of the base 6, a fixing hole 9 at the surface of the fixing block 8, an elastic brake plate 10 at the bottom of the fixing block 8, an universal wheel 12 at the bottom of the elastic brake plate 10, and a locating bolt 11 at the other side of the top of the universal wheel
12. The existing teaching board is not portable. If wanting to move it, teachers need to lift the whole teachmg board up with their hands. Such a movement will not only add additional burdens to teachers’ teaching work. but may also cause damages to the teaching board during moving. The fixable moving mechanism is provided. The universal wheel 12 is arranged at the bottom of the base 6. Teachers can move the teaching board by means of universal wheels 12. They can press the elastic brake plate 10 down in close contact with the universal wheel 12 after moving the teaching board to a designated position, and insert the locating bolt 11 into the fixing hole 9 to fix the elastic brake plate 10 and keep universal wheel 12 immovable, preventing the teaching board from moving during teaching, and improving the stability of the device.
Preferably, the detachable telescoping mechanism comprises a telescopic supporting rod 4 at the bottom of the magnetic explanation board 1, an embedded rod 15 in the telescopic supporting rod 4, an adjusting handle 16 at one side of the top of the embedded rod 15, a locating hole 17 at the surface of the embedded rod 15, a locating bolt 14 at the other side of the telescopic supporting rod 4, a cushion 18 at the internal bottom of the telescopic supporting rod 4, a moving groove 19 at the bottom of the telescopic supporting rod 4, an elastic mounting block 20 at one side of the moving groove 19, and a mounting groove 21 in the middle of the base 6. The existing teaching devices occupy a large space and most just face to one direction, resulting in usage limitation. The detachable telescoping mechanism is provided. The surface of the magnetic explanation board 1 is magnetic so that teachers can attach the teaching flashcards to the magnetic explanation board 1.
which can help improve students’ interest in leaning and strengthen their memory. The magnetic explanation board 1 is fixed in the moving groove 19, and moving steel balls are provided in the moving groove 19, so that the magnetic explanation board can rotate by 360 degrees. The moving groove 19 is installed in the mounting groove 21 by means of elastic mounting block 20. When the device is idle, the detachable telescoping mechanism and the mechanisms above can be dismantled, saving storage space.
Working principle: First, arrange the explanation board protection frame 2. The outer wall of the magnetic explanation board 1 is covered by the explanation board protection frame 2. When teachers cause the teaching board to collide against other objects unintentionally, the explanation board protection frame 2 can work as a buffer to prevent the magnetic explanation board 1 from being damaged: Then, arrange the writing tool groove 3. The teachers can directly put writing pens in the writing tool groove 3 when the writing pens are not required during teaching, rather than holding the writing pen in hand all the time: Next, arrange the book storage box 5. Teachers can put all teaching-related books in the book storage box 5 without having to carry them around, embodying the convenience of the book storage box 3; Afterwards, arrange the fixable moving mechanism. The universal wheel 12 is arranged at the bottom of the base 6. Teachers can move the teaching board by means of universal wheels 12. They can press the elastic brake plate 10 down in close contact with the universal wheel 12 after moving the teaching board to a designated position, and insert the locating bolt 11 into the fixing hole 9 to fix the elastic brake plate 10 and keep universal wheel 12 immovable, preventing the teaching board from moving during teaching, and improving the stability of the device; At last, arrange the detachable telescoping mechanism. The surface of the magnetic 5 explanation board 1 is magnetic so that teachers can attach the teaching flashcards to the magnetic explanation board 1, which can help improve students’ interest in learning and strengthen their memory. The magnetic explanation board 1 is fixed in the moving groove 19, and moving steel balls are provided in the moving groove 19, so that the magnetic explanation board can rotate by 360 degrees. The moving groove 19 is installed in the mounting groove 21 by means of elastic mounting block 20. When the device is idle, the detachable telescoping mechanism and the mechanisms above can be dismantled, saving storage space. This is the working principle of such a teaching device based on memory improvement.
Inthe numbered clauses below, specific embodiments are described:
1. A teaching device based on memory improvement, comprising a magnetic explanation board, a telescopic supporting rod and a base, characterized in that: the telescopic supporting rod is fixed at the bottom of the magnetic explanation board, an embedded rod is embedded in the telescopic supporting rod, an adjusting handle is fixed at one side of the top of the embedded rod, a locating hole is fixed at the surface of the embedded rod, a locating bolt is embedded in the other side of the telescopic supporting rod. a cushion is fixed at the internal bottom of the telescopic supporting rod, a moving groove is nested at the bottom of the telescopic supporting rod, an elastic mounting block is fixed at one side of the moving groove, a base is fixed at the bottom of the moving groove, a mounting groove is fixed in the middle of the base, a balance block is fixed in the base, a fixing block is fixed at one side of the bottom of the base, a fixing hole is fixed at the surface of the fixing block, an elastic brake plate is fixed at the bottom of the fixing block, an universal wheel is fixed at the bottom of the elastic brake plate. and a locating bolt is embedded in the other side of the top of the universal wheel; an explanation board protection frame is fixed at the outer wall of the magnetic explanation board; a writing tool groove is fixed at one side of the bottom of the explanation board protection frame;
2. The teaching device based on memory improvement according to clause 1, characterized in that: reinforced suction cups are fixed at the bottom of the base;
3. The teaching device based on memory improvement according to clause 1, characterized in that: a book storage box is fixed at the other side of the top of the base;
4. The teaching device based on memory improvement according to clause 1, characterized in that: the fixable moving mechanism comprises a balance block in the base. a fixing block at one side of the bottom of the base, a fixing hole at the surface of the fixing block, an elastic brake plate at the bottom of the fixing block, an universal wheel at the bottom of the elastic brake plate, and a locating bolt at the other side of the top of the universal wheel;
5. The teaching device based on memory improvement according to clause 1, characterized in that: the detachable telescoping mechanism comprises a telescopic supporting rod at the bottom of the magnetic explanation board, an embedded rod in the telescopic supporting rod, an adjusting handle at one side of the top of the embedded rod, a locating hole at the surface of the embedded rod, a locating bolt at the other side of the telescopic supporting rod, a cushion at the internal bottom of the telescopic supporting rod, a moving groove at the bottom of the telescopic supporting rod, an elastic mounting block at one side of the moving groove, and a mounting groove in the middle of the base.

Claims (5)

ConclusiesConclusions 1. Een onderwijsapparaat gebaseerd op geheugenverbetering, omvattende een magnetisch uitlegbord, een telescopische steunstang en een basis, met het kenmerk, dat: de telescopische steunstang is aangebracht aan de onderzijde van het magnetische uitlegbord, een ingebedde stang is ingebed in de telescopische steunstang, een verstelhendel is aangebracht aan een zijde van de bovenzijde van de ingebedde stang, een plaatsingsgat is aangebracht aan het oppervlak van de ingebedde stang, een plaatsingsbout is mgebed in de andere zijde van de telescopische steunstang, een kussen is aangebracht aan de binnenste onderzijde van de telescopische steunstang, een bewegingsgleuf is mgebed aan de onderzijde van de telescopische steunstang, een elastisch bevestigingsblok is aangebracht aan een zijde van de bewegingsgleuf, een basis is aangebracht aan de onderzijde van de bewegingsgleuf, een bevestigingsgleuf is aangebracht in het midden van de basis, een balanceringsblok is aangebracht in de basis, een bevestigingsblok is aangebracht aan een zijde van de onderzijde van de basis, een bevestigingsgat is aangebracht aan het oppervlak van het bevestigingsblok, een elastische remplaat is aangebracht aan de onderzijde van het bevestigingsblok. een universeel wiel is aanbracht aan de onderzijde van de elastische remplaat, en een plaatsingsbout is ingebed in de andere zijde van de bovenzijde van het universele wiel: een uitlegbordbeschermframe is aangebracht aan de buitenste wand van het magnetische uitlegbord. een schrijfinstrumentgleuf is aangebracht aan een zijde van de onderzijde van het uitlegbordbeschermframe.A memory enhancement teaching apparatus comprising a magnetic explanation board, a telescopic support rod and a base, characterized in that : the telescopic support rod is arranged on the underside of the magnetic explanation board, an embedded rod is embedded in the telescopic support rod, a adjustment lever is provided on one side of the top of the embedded rod, a locating hole is provided on the surface of the embedded rod, a locating bolt is embedded in the other side of the telescopic support rod, a pad is provided on the inner bottom of the telescopic support rod, a movement slot is embedded on the underside of the telescopic support rod, an elastic mounting block is provided on one side of the movement slot, a base is provided on the lower side of the movement slot, a mounting slot is provided in the center of the base, a balancing block is fitted in the base, a bev mounting block is provided on one side of the bottom side of the base, a mounting hole is provided on the surface of the mounting block, an elastic braking plate is provided on the bottom side of the mounting block. a universal wheel is provided on the underside of the elastic brake plate, and a locating bolt is embedded in the other side of the top of the universal wheel: a display board protecting frame is provided on the outer wall of the magnetic display board. a writing instrument slot is provided on a side of the underside of the display board protective frame. 2. Onderwijsapparaat gebaseerd op geheugenverbetering volgens conclusie 1, met het kenmerk, dat: versterkte zuignappen zijn aangebracht aan de onderzijde van de basis.A memory enhancement learning device according to claim 1, characterized in that : reinforced suction cups are provided on the underside of the base. 3. Onderwijsapparaat gebaseerd op geheugenverbetering volgens conclusie 1, met het kenmerk. dat: een boekopslagdoos is aangebracht aan de andere zijde van de bovenzijde van de basis.A memory enhancement educational device according to claim 1, characterized in. that: a book storage box is arranged on the other side of the top of the base. 4. Onderwijsapparaat gebaseerd op geheugenverbetering volgens conclusie 1, met het kenmerk, dat: het fixeerbare bewegingsmechanisme een balanceringsblok in de basis omvat. een bevestigingsblok aaneen zijde van de onderzijde van de basis, een bevestigmgsgat aan het oppervlak van het bevestigingsblok, een elastische remplaat aan de onderzijde van het bevestigingsblok, een universeel wiel aan de onderzijde van de elastische remplaat, en een plaatsingsbout aan de andere zijde van de bovenzijde van het universele wiel.The memory enhancement learning device according to claim 1, characterized in that : the fixable movement mechanism comprises a balancing block in the base. a fixing block on one side of the bottom side of the base, a fixing hole on the surface of the fixing block, an elastic brake plate on the bottom side of the fixing block, a universal wheel on the bottom side of the elastic brake plate, and a locating bolt on the other side of the top of the universal wheel. 5. Onderwijsapparaat gebaseerd op geheugenverbetering volgens conclusie 1, met het kenmerk, dat: het afneembare telescoopmechanisme een telescopische steunstang omvat aan de onderzijde van het magnetische uitlegbord, een ingebedde stang in de telescopische steunstang, een verstelhendel aan een zijde van de bovenzijde van de mgebedde stang, een plaatsingsgat aan het oppervlak van de ingebedde stang, een plaatsingsbout aan de andere zijde van de telescopische steunstang, een kussen aan de binnenste onderzijde van de telescopische steunstang, een bewegingsgleuf aan de onderzijde van de telescopische steunstang, een elastisch bevestigingsblok aan een zijde van de bewegingsgleuf, en een bevestigingsgleuf in het midden van de basis.A memory enhancement teaching device according to claim 1, characterized in that : the detachable telescope mechanism comprises a telescopic support rod on the underside of the magnetic display board, an embedded rod in the telescopic support rod, an adjustment lever on a side of the top of the embedded rod, a locating hole on the surface of the embedded rod, a locating bolt on the other side of the telescopic support rod, a pad on the inner bottom of the telescopic support rod, a movement slot on the underside of the telescopic support rod, an elastic fixing block on one side of the movement slot, and a mounting slot in the center of the base.
NL2023956A 2019-09-07 2019-10-03 Teaching Device Based on Memory Improvement NL2023956B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921482771.3U CN211632445U (en) 2019-09-07 2019-09-07 Education equipment for improving memory

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NL2023956B1 true NL2023956B1 (en) 2021-05-17

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BE (1) BE1027261B1 (en)
LU (1) LU101407B1 (en)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0725299D0 (en) * 2007-12-31 2008-02-06 Livermore Samuel E Portaboard
CN205824512U (en) * 2016-07-08 2016-12-21 满洲里俄语职业学院 A kind of portable information technology multimedia teaching frame
CN109345884A (en) * 2018-11-16 2019-02-15 江苏沃达视听科技有限公司 A kind of electronic blackboard fixed structure
CN209118422U (en) * 2019-01-21 2019-07-16 深圳市看门神电子有限公司 A kind of self-service accreditation all-in-one machine easy to remove

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BE1027261B1 (en) 2020-12-02
LU101407B1 (en) 2021-03-12

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