CN109215403A - A kind of teaching demonstration table - Google Patents
A kind of teaching demonstration table Download PDFInfo
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- CN109215403A CN109215403A CN201811232751.0A CN201811232751A CN109215403A CN 109215403 A CN109215403 A CN 109215403A CN 201811232751 A CN201811232751 A CN 201811232751A CN 109215403 A CN109215403 A CN 109215403A
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- 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
- G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electrically Operated Instructional Devices (AREA)
Abstract
The present invention provides a kind of teaching demonstration tables, it include the shell of table body Yu composition table body, shell has been screwed outside table body, shell both ends pass through recess-mounted respectively and are provided with the first data-interface and the second data-interface, table internal body portion is not provided with numerical value runner and data information converter, data information converter both ends are respectively arranged with data receiver port and data sending terminal mouth, data information converter inside is connected with network commutator by support shaft, wireless network receiver is provided with by welding inside network commutator, support shaft is internally provided with several data lines, the beneficial effects of the invention are as follows the existing teaching demonstration tools of effective solution to be difficult to understand convenient for student so as to cause existing teaching demonstration tool with modernizing teaching mode and equipment use, watch numerical value, the present invention can be effective Improve teaching process in ground.
Description
Technical field
The present invention relates to teaching demonstration field more particularly to a kind of teaching demonstration tables.
Background technique
It is generally imparted knowledge to students and is demonstrated convenient for student in study using multiple types of tools during teaching demonstration at present
Understand in the process, as science and technology carries out, teaching pattern is also more and more diversified, and wherein networked projection's teaching pattern is widely used,
Existing demonstration table is smaller and is difficult to connect networked projection and amplifies numerical value, seat in the student of heel row be difficult to observe numerical value from
And influence study schedule.
The teaching pattern of modernization can not be kept up in the existing tool used of imparting knowledge to students and teaching equipment use
To be not easy to student's understanding and be difficult to watch the numerical value in educational aid, existing demonstration is difficult to table according to wireless network
Reach real-time transform numerical value, so that student be made it difficult for examine numerical value with apparent according to demonstration.
Summary of the invention
To solve problem described above, the existing teaching demonstration tool of effective solution of the present invention cannot with modernization
Teaching pattern and equipment use are difficult to understand convenient for student, watch numerical value, this hair so as to cause existing teaching demonstration tool
It is bright to effectively improve teaching process.
In conjunction with problem described above, it to include table body and composition table body that the present invention provides a kind of teaching demonstration tables
Shell, be screwed shell outside the table body, the shell both ends pass through recess-mounted respectively and are provided with first
Data-interface and the second data-interface, the inside grooves two sides are inlaid with baffle, and the baffle bottom is welded with back spring, described
Baffle surface has been screwed fixture block, and described time spring extends to baffle surface connection fixture block, first data-interface with
Second data-interface outer wall is equipped with shrinkage pool, and the fixture block outer wall is fixedly connected with shrinkage pool inner wall, and the table internal body portion is not arranged
There are numerical value runner and data information converter, data information converter both ends are respectively arranged with data receiver port and data
Sending port, the data receiver port are embedded in data information converter side, and the data sending terminal mouth is embedded in data
Several network line pipes, institute are inlaid with inside the transcriber other side, the data receiver port and data sending terminal mouth
It states data information converter inside and network commutator is connected with by support shaft, the network line pipe extends to data information and turns
It is connect inside parallel operation with network commutator, four ends of the network commutator top pass through location hole and are inlaid with sheth, described
Sheth outer cover is equipped with magnet ring, passes through welding inside the network commutator and is provided with wireless network receiver, the support
Axis is internally provided with several data lines, and the data line both ends are separately connected wireless network receiver and data are sent
Port, the data receiver port connect network commutator；
Value pointer is connected with by turntable outside the table body, the disc surfaces stamp has numerical value letter, the turntable two
End is respectively arranged with the first transmission shaft and second driving shaft, and first transmission shaft one end connects second driving shaft one by gear
End, the second driving shaft other end connect value pointer by driving wheel, and the driving wheel both ends have each extended over large-scale tooth
Wheel and miniature gear are equipped with shaft inside the value pointer, and the shaft surface is arranged with several numerical value change wheels, described
Both ends of the shaft is provided with teeth, and the miniature gear is connect with teeth tooth form, and the large gear connects second driving shaft, institute
It states and electronic counter is provided with by spool inside numerical value runner, the electronic counter bottom is provided with idler wheel, and described first
The transmission shaft other end is extended to inside numerical value runner and is connect with idler wheel, is connected with circuit by spool inside the electronic counter
Chip processor, the circuit chip processor connect the first data-interface, and first data-interface connects the by spool
Two data-interfaces, second data-interface connect display by data connecting line, are connected at the top of the table body by bracket
There is display, the bracket uses hollow structure, and the bracket is made up of first support and second support plug connection, described
First support extends to inside second support, and the first support outer wall is connected with second support inner wall, the first support
Pressure spring is arranged between second support, described first support one end is screwed at the top of table body, and the second support is prolonged
Display interior is extended to, the display interior is provided with numerical value display screen, and the data connecting line is set to internal stent；
It is provided with threaded hole at the top of the display, wireless network transmissions antenna is plugged with inside the threaded hole, it is described wireless
Network transmission antenna connects numerical value display screen.
As described above, effectively transmitting day by the threaded hole Fixed Cellular Network being provided at the top of numerical value runner display
Line, so that data projection effectively is carried out by wireless network transmissions antenna transmission data to computer or projection device, with
And numerical value display screen is connected by wireless network transmissions antenna and shows value data, pass through numerical value runner conversion electron numerical value to number
According to transcriber, to carry out data network transmission and the received effect of network by data information converter.
Wireless display equipment or computer are effectively connected to reach aobvious according to the wireless network transmissions antenna of display
Show the numerical value of display, data conversion is effectively carried out by the numerical value of data information converter transforming numerical pointer, effectively
Be delivered in computer or projection device by network commutator, the existing teaching demonstration tool of effective solution cannot with it is existing
Generationization teaching pattern and equipment use are difficult to understand convenient for student, watch numerical value so as to cause existing teaching demonstration tool,
The present invention can effectively improve teaching process.
Further, the display casing is connected and composed by several transparent plastic shells.
As described above, effectively being constituted according to by display casing using transparent plastic shell, to preferably improve
Visibility is convenient for student viewing display, to preferably be convenient for looking around.
Further, several card slot holes, the first support and second support junction are provided with outside the second support
It is provided with locating rod, the locating rod is internally provided with pressure spring, and the locating rod both ends are respectively arranged with the first fixture block and second
Fixture block, the pressure spring both ends are separately connected the first fixture block and the second fixture block, first fixture block and the second fixture block with card slot hole
Plug connection.
As described above, effectively being entered inside second support according to first support grafting, it is arranged by second support shell
The first fixture block, the second fixture block plug connection that some card slot holes and locating rod both ends are provided with are to reach the work of fixed support
With effective fixed first support makes in the effect of the grafting spacing of second support, by the first fixture block of pressing with the second fixture block
Pressure spring contraction inside locating rod, which reaches, adjusts first support in the spacing of second support, to reach control display in table body
The effect of the spacing at top, and more preferably numerical value is looked around convenient for student.
Further, the shell is connected and composed by upper shell with lower casing respectively, and the upper shell is connect with lower casing
The circle that is magnetic is arranged in place, is filled with several magnetic-particles inside the upper shell and lower casing.
As described above, effectively being connect with lower casing by magnetic circle magnetism according to upper shell, consequently facilitating preferably solid
Surely protect table body under the action of also can it is easy to disassemble and adjustment table body, effectively filled by upper shell with inside lower casing
Some magnetic-particles can glue glutinous shell on blackboard, thus reach viscous glutinous table body on blackboard convenient for imparting knowledge to students and receiving data,
And numerical value is looked around convenient for student.
The invention has the advantages that effectively connecting wireless display equipment by the wireless network transmissions antenna of display
Or computer is to reach the numerical value of display display, effectively by the numerical value of data information converter transforming numerical pointer into
Row data conversion is effectively delivered in computer or projection device by network commutator, the existing religion of effective solution
Learning presentation tool cannot be difficult to be convenient for modernizing teaching mode and equipment use so as to cause existing teaching demonstration tool
Student understands, watches numerical value, and the present invention can effectively improve teaching process.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is turntable structure schematic diagram of the invention.
Fig. 3 is shell mechanism schematic diagram of the invention.
Fig. 4 is supporting structure schematic diagram of the invention.
Fig. 5 is data information converter structure schematic diagram of the invention.
Fig. 6 is driving wheel and pivot structure schematic diagram of the invention.
Fig. 7 is inside grooves structural schematic diagram.
In conjunction with shown in the mark in figure: table body 1, shell 2, the first data-interface 3, the second data-interface 4, numerical value runner 5,
Data information converter 6, support shaft 7, turntable 8, display 9, bracket 10, upper shell 21, lower casing 22, magnetic circle 23, magnetism
Particle 24, groove 25, electronic counter 51, idler wheel 52, circuit chip processor 53, data receiver port 61, data sending terminal
Mouth 62, network commutator 63, wireless network receiver 64, data line 71, the first transmission shaft 81, second driving shaft 82, number
Be worth pointer 83, driving wheel 84, numerical value display screen 91, threaded hole 92, radio transmission antenna 93, pressure spring 99, network line pipe 100,
Data connecting line 101, first support 102, second support 103, locating rod 104, card slot hole 113, the first fixture block 114, second card
Block 115, baffle 251, returns spring 252, fixture block 253, shrinkage pool 254, sheth 631, magnet ring 632, location hole 633, turns at pressure spring 116
Axis 831, numerical value change wheel 832, teeth 833, large gear 841, miniature gear 842.
Specific embodiment
Referring to figs. 1 to Fig. 7, a kind of teaching demonstration table includes the shell 2 of table body 1 Yu composition table body, outside table body 1
It is screwed shell 2,2 both ends of shell pass through groove 25 respectively inlays and be provided with the first data-interface 3 and the second data
Interface 4,25 inside two sides of groove are inlaid with baffle 251, and 251 bottom of baffle is welded with back spring 252, and 251 surface of baffle passes through spiral shell
Silk is fixed with fixture block 253, returns spring 252 and extends to 251 surface of baffle connection fixture block 253, the first data-interface 3 connects with the second data
4 outer walls of mouth are equipped with shrinkage pool 254, and 253 outer wall of fixture block is fixedly connected with 254 inner wall of shrinkage pool, and shell 2 is screwed in table body 1
Outside, 2 both ends of shell are inlaid with the first data-interface 3 and the second data-interface 4 by groove 25, are fixed by 25 structure of groove
Data-interface carries out receiving data while also just also by 25 dismounting and change data-interface of groove to be suitable for different table bodies
1, numerical value runner 5 and data information converter 6 are respectively arranged with inside table body 1；
6 both ends of data information converter are respectively arranged with data receiver port 61 and data sending terminal mouth 62, data receiver port
61 are embedded in 6 side of data information converter, and data sending terminal mouth 62 is embedded in 6 other side of data information converter, the number
According to being inlaid with several network line pipes 100, data receiver port 61 and number inside receiving port 61 and data sending terminal mouth 62
It is arranged according to the structure that sending port 62 is set to data converter two sides by data receiver port 61 and data sending terminal mouth 62
The composition number of data information converter 6 is transmitted in 6 two sides of data information converter to receive data by network line pipe 100
According to the structure for receiving conveying, network commutator 63, network line pipe are connected with by support shaft 7 inside data information converter 6
100 extend to 6 inside of data information converter connect with network commutator 63, and 63 top of network commutator, four ends pass through positioning
Hole is inlaid with sheth 631, and 631 outer cover of sheth is equipped with magnet ring 632,63 outside framework item 631 of network commutator and
The magnet ring 632 that 631 outer cover of sheth is equipped with has anti-interference structure, is wrapped in outside network commutator 63 by anti-tampering, prevents
Interference structure can protect network commutator 63 and be converted, and transmit during being measured on the spot using demonstration with table convenient for field
It is convenient for observation of students numerical value in data to classroom, passes through welding inside network commutator 63 and be provided with wireless network receiver 64,
Support shaft 7 is internally provided with several data lines 71,71 both ends of data line be separately connected wireless network receiver 64 with
Data sending terminal mouth 62, data receiver port 61 connect network commutator 63；
The effective 92 Fixed Cellular Network transmission antenna 93 of threaded hole by being provided at the top of numerical value runner 5 and display 9, from
And computer or projection device progress data projection, Yi Jitong are effectively transferred data to by wireless network transmissions antenna 93
It crosses wireless network transmissions antenna 93 and connects the display value data of numerical value display screen 91, extremely by 5 conversion electron numerical value of numerical value runner
Data information converter 6, to carry out data network transmission and the received effect of network by data information converter 6.
Value pointer 83 is connected with by turntable 8 outside table body 1, the stamp of 8 surface of turntable has numerical value letter, 8 both ends of turntable
It is respectively arranged with the first transmission shaft 81 and second driving shaft 82,81 one end of the first transmission shaft connects second driving shaft 82 by gear
One end, 82 other end of second driving shaft connect value pointer 83 by driving wheel 84, and 84 both ends of driving wheel have each extended over large size
Gear 841 and miniature gear 842 are equipped with shaft 831 inside value pointer 83, and 831 surface of shaft is arranged with several numerical value and becomes
More wheel 832,831 both ends of shaft are provided with teeth 833, and miniature gear 842 is connect with 833 tooth form of teeth, and large gear 841 connects
Second driving shaft 82 is connect, value pointer 83 is connected by driving wheel 84 and reaches drive mechanism, is made in 83 rotation process of value pointer
52 structure of idler wheel for triggering 51 bottom of electronic counter, by 52 structure Triggering circuit chip processor 53 of idler wheel to reach benefit
Activation data transmission structure is provided with electricity by spool inside numerical value runner 5 to projection device during being measured with table body 1
Sub-count device 51,51 bottom of electronic counter are provided with idler wheel 52, and 81 other end of the first transmission shaft extends to inside numerical value runner 5
It is connect with idler wheel 52, circuit chip processor 53, circuit chip processor 53 is connected with by spool inside electronic counter 51
The first data-interface 3 is connected, the first data-interface 3 connects the second data-interface 4 by spool, and the second data-interface 4 passes through number
Display 9 is connected according to connecting line 101, passes through bracket 10 at the top of table body 1 and is connected with display 9, bracket 10 uses hollow structure, branch
Frame 10 is made up of first support 102 and 103 plug connection of second support, and first support 102 extends in second support 103
Portion, 102 outer wall of first support are connected with 103 inner wall of second support, and pressure is arranged between first support 102 and second support 103
Spring 99,1 top side of table body are connected with display 9 by bracket 10, to effectively carry out stretching structure pair by bracket 10
Display 9 carries out telescopic moving and carries out far convenient for observation numerical value and by the wireless network transmissions antenna 93 at 9 top of display
Distance Transmission numerical value is convenient for can also transmit detection numerical value to computer-projector end with table even at remote middle use numerical value
The effect of teaching demonstration is carried out, 102 one end of first support is screwed in 1 top of table body, and second support 103 extends to aobvious
Show inside device 9, display 9 is internally provided with numerical value display screen 91, and data connecting line 101 is set to inside bracket 10；
It is provided with threaded hole 92 at the top of display 9, wireless network transmissions antenna 93 is plugged with inside threaded hole 92, wireless network passes
Defeated antenna 93 connects numerical value display screen 91, effectively connects wireless display according to the wireless network transmissions antenna 93 of display 9 and sets
Standby or computer shows the numerical value of display 9 to reach, and effectively passes through 6 transforming numerical pointer 83 of data information converter
Numerical value carries out data conversion, is effectively delivered in computer or projection device by network commutator 63, effective solution
Existing teaching demonstration tool cannot be with modernizing teaching mode and equipment use so as to cause existing teaching demonstration tool
It is difficult to understand convenient for student, watches numerical value, the present invention can effectively improve teaching process.
9 shell of display is connected and composed by several transparent plastic shells, is effectively used according to by 9 shell of display
Transparent plastic shell is constituted, to preferably improve visibility, is convenient for student viewing display, to preferably be convenient for looking around.
Several card slot holes 113 are provided with outside second support 103,102 second support of first support, 103 junction is provided with
Locating rod 104, locating rod 104 are internally provided with pressure spring 116, and 104 both ends of locating rod are respectively arranged with the first fixture block 114 and second
Fixture block 115,116 both ends of pressure spring are separately connected the first fixture block 114 and the second fixture block 115, the first fixture block 114 and the second fixture block 115
With 113 plug connection of card slot hole, is effectively entered inside second support 103 according to 102 grafting of first support, pass through second
The first fixture block 114 that the card slot hole 113 that is provided with outside frame 103 and 104 both ends of locating rod are provided with, 115 grafting of the second fixture block
Connection is to have the function that fixed support, and effective fixed first support 102 is in the work of the grafting spacing of second support 103
With, by pressing the first fixture block 114 and the second fixture block 115 make the pressure spring inside locating rod 104 shrink reach adjusting first support
102 in the spacing of second support 103, to have the function that control spacing of the display 6 at the top of table body, and is more preferably convenient for
Student looks around numerical value.
Shell 2 is connected and composed by upper shell 21 with lower casing 22 respectively, and upper shell 21 is arranged with 22 junction of lower casing
Be magnetic circle 23, upper shell 21 with several magnetic-particles 24 are filled with inside lower casing 22, effectively according to upper shell 21 with
Lower casing 22 by the magnetic connection of magnetic circle 23, consequently facilitating preferably under the action of fixed protection table body also can it is easy to disassemble with
And adjustment table body, glutinous shell effectively can be glued in black by the magnetic-particle 24 being filled with inside upper shell 21 and lower casing 22
On plate, to reach viscous glutinous table body in convenient for imparting knowledge to students and receive data, and looking around numerical value on blackboard convenient for student.
It is solid by the threaded hole 92 being provided at the top of numerical value runner 5 and display 9 that the beneficial effects of the invention are as follows effective
Wireless network transmissions antenna 93 is determined, to effectively transfer data to computer or projection by wireless network transmissions antenna 93
Equipment carries out data projection, and connects numerical value display screen 91 by wireless network transmissions antenna 93 and show value data, passes through
5 conversion electron numerical value of numerical value runner is to data information converter 6, to carry out data network biography by data information converter 6
The received effect of defeated and network.
Wireless display equipment or computer are effectively connected to reach by the wireless network transmissions antenna 93 of display 9
It shows the numerical value of display 9, data conversion is effectively carried out by the numerical value of 6 transforming numerical pointer of data information converter, is had
Effect ground is delivered in computer or projection device by network commutator 63, and the existing teaching demonstration tool of effective solution is not
It can be difficult to understand convenient for student so as to cause existing teaching demonstration tool with modernizing teaching mode and equipment use, watch
Numerical value, the present invention can effectively improve teaching process.
Claims (4)
1. a kind of teaching demonstration table includes table body (1) and the shell (2) for constituting table body, which is characterized in that the table body
(1) external to be screwed shell (2), shell (2) both ends pass through groove (25) respectively inlays and is provided with the first number
According to interface (3) and the second data-interface (4), the internal two sides of the groove (25) are inlaid with baffle (251), the baffle (251)
Bottom is welded with back spring (252), and baffle (251) surface has been screwed fixture block (253), and described time spring (252) is prolonged
Baffle (251) surface connection fixture block (253) is extended to, first data-interface (3) is equipped with recessed with the second data-interface (4) outer wall
Hole (254), fixture block (253) outer wall are fixedly connected with shrinkage pool (254) inner wall, are respectively arranged with number inside the table body (1)
It is worth runner (5) and data information converter (6), data information converter (6) both ends are respectively arranged with data receiver port
(61) and data sending terminal mouth (62), the data receiver port (61) are embedded in data information converter (6) side, the number
Data information converter (6) other side, the data receiver port (61) and data sending terminal are embedded according to sending port (62)
It is inlaid with several network line pipes (100) inside mouth (62), passes through support shaft (7) inside the data information converter (6)
It is connected with network commutator (63), the network line pipe (100) extends to data information converter (6) inside and converts with network
Device (63) connection, four ends of network commutator (63) top pass through location hole and are inlaid with sheth (631), the sheth
(631) outer cover is equipped with magnet ring (632), and welding is provided with wireless network receiver inside the network commutator (63)
(64), the support shaft (7) is internally provided with several data lines (71), and data line (71) both ends are separately connected
Wireless network receiver (64) and data sending terminal mouth (62), the data receiver port (61) connect network commutator (63)；
It is connected with value pointer (83) outside the table body (1) by turntable (8), turntable (8) the surface stamp has numeric word
Mother, turntable (8) both ends are respectively arranged with the first transmission shaft (81) and second driving shaft (82), first transmission shaft (81)
One end connects second driving shaft (82) one end by gear, and second driving shaft (82) other end is connected by driving wheel (84)
Value pointer (83), driving wheel (84) both ends have each extended over large gear (841) and miniature gear (842), the number
It is equipped with shaft (831) inside value pointer (83), shaft (831) surface is arranged with several numerical value change wheels (832), described
Shaft (831) both ends are provided with teeth (833), and the miniature gear (842) connect with teeth (833) tooth form, the large size
Gear (841) connects second driving shaft (82), and the numerical value runner (5) is internal to be provided with electronic counter (51) by spool,
Electronic counter (51) bottom is provided with idler wheel (52), and the first transmission shaft (81) other end extends to numerical value runner
(5) internal to connect with idler wheel (52), the electronic counter (51) is internal to be connected with circuit chip processor (53) by spool,
The circuit chip processor (53) connects the first data-interface (3), and first data-interface (3) passes through spool connection second
Data-interface (4), second data-interface (4) pass through data connecting line (101) connection display (9), table body (1) top
Portion is connected with display (9) by bracket (10), and the bracket (10) uses hollow structure, and the bracket (10) passes through first
Frame (102) and second support (103) plug connection are constituted, and the first support (102) extends to second support (103) inside,
First support (102) outer wall is connected with second support (103) inner wall, the first support (102) and second support
(103) it being arranged between pressure spring (99), described first support (102) one end is screwed at the top of table body (1), and described second
Bracket (103) extends to display (9) inside, and the display (9) is internally provided with numerical value display screen (91), and the data connect
It is internal that wiring (101) is set to bracket (10)；
It is provided with threaded hole (92) at the top of the display (9), is plugged with wireless network transmissions day inside the threaded hole (92)
Line (93), the wireless network transmissions antenna (93) connect numerical value display screen (91).
2. a kind of teaching demonstration table according to claim 1, which is characterized in that display (9) shell passes through several
Transparent plastic shell connects and composes.
3. a kind of teaching demonstration table according to claim 1, which is characterized in that setting outside the second support (103)
There are several card slot holes (113), the first support (102) and second support (103) junction are provided with locating rod (104), institute
Locating rod (104) is stated to be internally provided with pressure spring (116), locating rod (104) both ends be respectively arranged with the first fixture block (114) with
Second fixture block (115), pressure spring (116) both ends are separately connected the first fixture block (114) and the second fixture block (115), and described first
Fixture block (114) and the second fixture block (115) with card slot hole (113) plug connection.
4. a kind of teaching demonstration table according to claim 1, which is characterized in that the shell (2) passes through upper shell respectively
(21) it is connected and composed with lower casing (22), the upper shell (21) and the setting of lower casing (22) junction are magnetic circle (23), institute
It is internal filled with several magnetic-particles (24) to state shell (21) and lower casing (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811232751.0A CN109215403A (en) | 2018-10-23 | 2018-10-23 | A kind of teaching demonstration table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811232751.0A CN109215403A (en) | 2018-10-23 | 2018-10-23 | A kind of teaching demonstration table |
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| Publication Number | Publication Date |
|---|---|
| CN109215403A true CN109215403A (en) | 2019-01-15 |
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|---|---|---|---|
| CN201811232751.0A Pending CN109215403A (en) | 2018-10-23 | 2018-10-23 | A kind of teaching demonstration table |
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