CN216053367U - Intelligent teaching ecological device - Google Patents
Intelligent teaching ecological device Download PDFInfo
- Publication number
- CN216053367U CN216053367U CN202122720550.9U CN202122720550U CN216053367U CN 216053367 U CN216053367 U CN 216053367U CN 202122720550 U CN202122720550 U CN 202122720550U CN 216053367 U CN216053367 U CN 216053367U
- Authority
- CN
- China
- Prior art keywords
- intelligent
- teaching
- ecological
- pipe
- student
- 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.)
- Active
Links
Images
Abstract
The utility model provides an intelligent ecological teaching device, and relates to the technical field of teaching equipment. The utility model provides an ecological device of intelligent teaching, includes handwriting all-in-one, all-in-one and cloud platform of going to class, and the handwriting all-in-one includes terminal equipment and the board is write to the intelligence that is used for the student to write, and board and terminal equipment communication connection are write to intelligence, and all-in-one of going to class includes the projecting apparatus and with projecting apparatus communication connection's first computer, first computer and terminal equipment respectively with cloud platform communication connection. The teacher transmits courseware to the projector through first computer, and the projector carries out the projection to courseware. The student watches the teacher through the intelligent writing board and attends a class. The teacher can issue classroom homework through first computer, and the student answers through writing the board intelligently, has reached teaching, learning, practise integrative effect. This ecological device of intelligent teaching has perfected current teaching mode to student's study and teacher's teaching, has made things convenient for student's study and teacher's teaching, has further satisfied the ecological construction requirement of education.
Description
Technical Field
The utility model relates to the technical field of teaching equipment, in particular to an intelligent ecological teaching device.
Background
With the popularization of education hardware equipment and the gradual realization of more education links on-line, the delivery scenes of the links of education, learning, measurement, evaluation and practice are changed, the functions and the performance of the traditional learning tool need to be iterated continuously to adapt to the change of the learning scene of a user, and the updating speed of the learning tool is accelerated. Along with the gradual and clear requirements of national policies on personalized and ubiquitous education, the requirements on education software and hardware cooperation capability and education ecological construction are further improved.
However, at present, there is no complete teaching auxiliary device, which provides convenience for students to study and teachers to teach.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an intelligent ecological teaching device which can provide a set of complete teaching auxiliary equipment, provides convenience for students to study and teachers to meet the requirements of ecological construction of education.
The embodiment of the utility model is realized by the following steps:
the embodiment of the application provides an ecological device of intelligent teaching, it includes handwriting all-in-one, all-in-one and cloud platform of giving lessons, and the handwriting all-in-one includes terminal equipment and the board is write to the intelligence that is used for the student to write, and the board is write to intelligence and terminal equipment communication connection, and the all-in-one of giving lessons includes projecting apparatus and the first computer with projecting apparatus communication connection, first computer and terminal equipment respectively with cloud platform communication connection.
In some embodiments of the present invention, the smart writing board includes a mounting housing and a tablet body disposed in the mounting housing, and the mounting housing is provided with a handheld mechanism.
In some embodiments of the present invention, the above-mentioned hand-held mechanism includes a bellows, one end of the bellows is disposed on the mounting housing, and the other end of the bellows is a tension end.
In some embodiments of the present invention, the mounting housing is provided with a placement groove, the bellows is disposed in the placement groove, and one end of the bellows is connected to an inner wall of the placement groove through a detachable assembly.
In some embodiments of the present invention, the detachable assembly includes a first pipe and a second pipe, one end of the first pipe is fixed to the inner wall of the placement groove, the other end of the first pipe is in threaded connection with the second pipe, and the second pipe is connected with the corrugated pipe.
In some embodiments of the present invention, the pulling end is provided with a base, and the base is detachably connected with the corrugated pipe.
In some embodiments of the utility model, the smart writing pad comprises a touch screen.
In some embodiments of the present invention, the smart writing board further includes a stylus and a control module, the touch screen includes a writing surface, the touch screen is configured to sense writing operation of the stylus through the writing surface and generate touch coordinate data, the touch screen is connected to the control module, and the control module is configured to generate handwriting according to the touch coordinate data.
In some embodiments of the present invention, the writing surface is covered with an anti-uv and anti-blue-light eye-protecting film.
In some embodiments of the present invention, the terminal device at least includes a mobile phone and a second computer.
Compared with the prior art, the embodiment of the utility model has at least the following advantages or beneficial effects:
the utility model provides an intelligent teaching ecological device which comprises a handwriting all-in-one machine, a lesson all-in-one machine and a cloud platform, wherein the handwriting all-in-one machine comprises terminal equipment and an intelligent writing board used for writing for students, the intelligent writing board is in communication connection with the terminal equipment, the lesson all-in-one machine comprises a projector and a first computer in communication connection with the projector, and the first computer and the terminal equipment are in communication connection with the cloud platform respectively. The teacher transmits courseware to the projector through first computer, and the projector carries out the projection to courseware. The student watches the teacher to give class through the board is write to intelligence, and the board is write to intelligence can make things convenient for the student to study anytime and anywhere, and then adapts to the change of student's study scene. The teacher can issue the classroom work through first computer, and the student passes through the intelligence and writes the board answer, and terminal equipment transmits the classroom work of submitting the student to the cloud platform, has reached teaching, learning, the effect of practicing an organic whole. This ecological device of intelligent teaching has perfected current teaching mode to student's study and teacher's teaching, has made things convenient for student's study and teacher's teaching, has further satisfied the ecological construction requirement of education.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of an intelligent ecological teaching device according to an embodiment of the present invention;
fig. 2 is a schematic rear view of a mounting housing according to an embodiment of the present invention;
FIG. 3 is a schematic rear view of another mounting housing provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of a corrugated pipe to be installed according to an embodiment of the present invention;
FIG. 5 is a side view of a mounting housing according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a smart writing board according to an embodiment of the present invention;
FIG. 7 is a control block diagram of an intelligent writing board according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a base according to an embodiment of the present invention.
Icon: 1-a handwriting all-in-one machine; 101-smart writing board; 1011-mounting a housing; 1012-touch screen; 1013-stylus pen; 102-a terminal device; 2-a cloud platform; 3, an all-in-one machine for class; 301-a projector; 302-a first computer; 4-a first tube; 5-a second tube; 6-a base; 7-mounting grooves; 8-a control module; 9-a mobile phone; 10-a second computer; 11-a bellows; 12-placing the groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, or an orientation or a positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience and simplicity, and the indication or the suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the present invention should not be construed as being limited. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, "a plurality" represents at least 2.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
Referring to fig. 1, fig. 1 is a block diagram illustrating an intelligent ecological teaching device according to an embodiment of the present invention.
The embodiment provides an intelligent teaching ecological device, it includes handwriting all-in-one 1, all-in-one 3 and cloud platform 2 in class, handwriting all-in-one 1 includes terminal equipment 102 and is used for the intelligence of student to write board 101, intelligence write board 101 and terminal equipment 102 communication connection, all-in-one 3 in class includes projecting apparatus 301 and the first computer 302 with projecting apparatus 301 communication connection, first computer 302 and terminal equipment 102 respectively with cloud platform 2 communication connection.
Specifically, the teacher transmits courseware to the projector 301 through the first computer 302, and the projector 301 projects the courseware. The student watches the teacher through the intelligence board 101 of writing, and the intelligence board 101 of writing can make things convenient for the student to study anytime and anywhere, and then adapts to the change of student's study scene. The teacher can issue classroom work through first computer 302, and the student answers through writing board 101, and terminal equipment 102 transmits the classroom work of submitting the student to cloud platform 2, has reached the effect of teaching, learning, practising an organic whole. And the teacher can start the whiteboard function through the first computer 302 to perform classroom blackboard writing, so that the dust falling and the unclear writing caused by chalk usage are avoided. The utility model provides an ecological device of intelligent teaching perfects current teaching mode to student's study and teacher's teaching, has made things convenient for student's study and teacher's teaching, has further satisfied the ecological construction requirement of education.
Example 2
Referring to fig. 2, fig. 3 and fig. 5, fig. 2 is a schematic back view of a mounting housing 1011 according to an embodiment of the present invention, fig. 3 is a schematic back view of another mounting housing 1011 according to an embodiment of the present invention, and fig. 5 is a schematic side view of the mounting housing 1011 according to an embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 1 is the same basically, and its main difference lies in: the intelligent writing board 101 comprises an installation shell 1011 and a writing board body arranged in the installation shell 1011, and a handheld mechanism is arranged on the installation shell 1011.
Specifically, the tablet body is mounted into the mounting housing 1011. When the user uses the tablet 101, the tablet 101 can be held in hand by a hand-held mechanism, thereby facilitating the student to watch the course video and complete the course homework.
Example 3
Referring to fig. 2, fig. 3 and fig. 5, fig. 2 is a schematic back view of a mounting housing 1011 according to an embodiment of the present invention, fig. 3 is a schematic back view of another mounting housing 1011 according to an embodiment of the present invention, and fig. 5 is a schematic side view of the mounting housing 1011 according to an embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 2 is the same basically, and its main difference lies in: the handheld mechanism comprises a corrugated pipe 11, one end of the corrugated pipe 11 is arranged on the installation shell 1011, and the other end of the corrugated pipe 11 is a tension end.
Specifically, the bellows 11 refers to a tubular elastic sensitive element formed by connecting foldable corrugated sheets along the folding and stretching direction. The user can pull on the pull end to adjust the length of the bellows 11 to achieve the desired length of the bellows 11. And the user can adjust the bending angle of bellows 11 along a plurality of directions, further satisfies student's user demand.
Example 4
Referring to fig. 2 to 4, fig. 2 is a schematic diagram of a back surface of an installation housing 1011 according to an embodiment of the present invention, fig. 3 is a schematic diagram of a back surface of another installation housing 1011 according to an embodiment of the present invention, and fig. 4 is a schematic diagram of a corrugated tube 11 to be installed according to an embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 3 is the same basically, and its main difference lies in: the mounting shell 1011 is provided with a placing groove 12, the corrugated pipe 11 is arranged in the placing groove 12, and one end of the corrugated pipe 11 is connected with the inner wall of the placing groove 12 through a detachable component.
Specifically, when the housing 1011 is stored and mounted, the bellows 11 is returned to the contracted state, and the bellows 11 in the contracted state is accommodated in the accommodating groove 12, thereby reducing the accommodating space of the bellows 11 as much as possible.
Wherein, above-mentioned removable assembly can make and can dismantle between bellows 11 and the standing groove 12 inner wall to convenience of customers can be according to the own demand selection whether install bellows 11 in standing groove 12, with more adaptation user's actual demand.
Example 5
Referring to fig. 4, fig. 4 is a schematic view of a corrugated pipe 11 to be installed according to an embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 4 is the same basically, and its main difference lies in: the detachable assembly comprises a first pipe 4 and a second pipe 5, one end of the first pipe 4 is fixed on the inner wall of the placing groove 12, the other end of the first pipe 4 is in threaded connection with the second pipe 5, and the second pipe 5 is connected with the corrugated pipe 11.
In particular, the first tube 4 and the second tube 5 are detachably connected. When the corrugated pipe 11 is required to be mounted on the inner wall of the placement groove 12, the first pipe 4 and the second pipe 5 are screwed. When the corrugated pipe 11 needs to be detached from the inner wall of the placement groove 12, the first pipe 4 and the second pipe 5 are separated and detached in a rotating manner. Thereby achieving the effect of being detachable between the corrugated pipe 11 and the inner wall of the placing groove 12.
Example 6
Referring to fig. 2, fig. 5 and fig. 8, fig. 2 is a schematic diagram of a back side of a mounting housing 1011 according to an embodiment of the present invention, fig. 5 is a schematic diagram of a side of the mounting housing 1011 according to the embodiment of the present invention, and fig. 8 is a schematic diagram of a structure of a base 6 according to the embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 3 is the same basically, and its main difference lies in: the pulling force end is provided with base 6, and base 6 can be dismantled with bellows 11 and be connected.
Specifically, the tension end of the corrugated pipe 11 is mounted on the base 6, so that the intelligent writing board 101 can be erected on a student desk through the base 6, and a user can watch videos and answer questions conveniently.
In some embodiments of the present invention, the base 6 is provided with a mounting groove 7. The pulling end of the corrugated pipe 11 is installed on the installation groove 7, so that the effect of installing the corrugated pipe 11 and the base 6 is achieved. The corrugated pipe 11 is pulled out from the mounting groove 7, so that the corrugated pipe 11 and the base 6 can be detached.
Example 7
Referring to fig. 6, fig. 6 is a schematic structural diagram of an intelligent writing board 101 according to an embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 1 is the same basically, and its main difference lies in: the smart writing tablet 101 includes a touch screen 1012.
Specifically, the touch screen 1012 is an inductive liquid crystal display device capable of receiving input signals such as a touch, and is suitable for multimedia teaching. The student can select the desired function directly by touching the touch screen 1012.
Example 8
Referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of a smart writing board 101 according to an embodiment of the present invention, and fig. 7 is a control block diagram of the smart writing board 101 according to an embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 7 is the same basically, and its main difference lies in: the smart writing board 101 further includes a stylus 1013 and a control module 8, the touch screen 1012 includes a writing surface, the touch screen 1012 is configured to sense a writing operation of the stylus 1013 through the writing surface and generate touch coordinate data, the touch screen 1012 is connected to the control module 8, and the control module 8 is configured to generate handwriting according to the touch coordinate data.
Specifically, the stylus 1013 is used for writing on the smart board, and the writing surface may dynamically collect a trajectory of the stylus 1013 in the writing process and generate touch coordinate data to be transmitted to the control module 8, so that the control module 8 generates handwriting, and the handwriting is displayed on the writing surface for a user to use.
Example 9
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 8 is the same basically, and its main difference lies in: the writing surface is covered with an anti-ultraviolet and anti-blue-light eye-protecting film.
Specifically, the anti-ultraviolet and anti-blue-light eye protection film can effectively protect the eyesight of students.
Example 10
Referring to fig. 1, fig. 1 is a block diagram illustrating an intelligent ecological teaching device according to an embodiment of the present invention.
This embodiment provides an ecological device of intelligent teaching, and the ecological device of intelligent teaching who provides with embodiment 1 is the same basically, and its main difference lies in: the terminal device 102 includes at least a mobile phone 9 and a second computer 10.
Specifically, the smart writing board 101 can be connected to a terminal device 102 such as the mobile phone 9 and the second computer 10 for use.
In summary, the embodiment of the present invention provides an intelligent teaching ecological device, which includes a handwriting all-in-one machine 1, a lesson all-in-one machine 3, and a cloud platform 2, where the handwriting all-in-one machine 1 includes a terminal device 102 and an intelligent writing board 101 for student writing, the intelligent writing board 101 is in communication connection with the terminal device 102, the lesson all-in-one machine 3 includes a projector 301 and a first computer 302 in communication connection with the projector 301, and the first computer 302 and the terminal device 102 are in communication connection with the cloud platform 2, respectively. The teacher transmits courseware to the projector 301 through the first computer 302 and the projector 301 projects the courseware. The student watches the teacher through the intelligence board 101 of writing, and the intelligence board 101 of writing can make things convenient for the student to study anytime and anywhere, and then adapts to the change of student's study scene. The teacher can issue classroom work through first computer 302, and the student answers through writing board 101, and terminal equipment 102 transmits the classroom work of submitting the student to cloud platform 2, has reached the effect of teaching, learning, practising an organic whole. And the teacher can start the whiteboard function through the first computer 302 to perform classroom blackboard writing, so that the dust falling and the unclear writing caused by chalk usage are avoided. The utility model provides an ecological device of intelligent teaching perfects current teaching mode to student's study and teacher's teaching, has made things convenient for student's study and teacher's teaching, has further satisfied the ecological construction requirement of education.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an ecological device of intelligent teaching, its characterized in that, includes handwriting all-in-one, all-in-one and cloud platform of giving lessons, handwriting all-in-one includes terminal equipment and the board is write to the intelligence that is used for the student to write, intelligence write the board with terminal equipment communication connection, all-in-one of giving lessons include the projecting apparatus and with projecting apparatus communication connection's first computer, first computer with terminal equipment respectively with cloud platform communication connection.
2. The intelligent ecological teaching device of claim 1, wherein the intelligent writing board comprises a mounting housing and a writing board body arranged in the mounting housing, and a handheld mechanism is arranged on the mounting housing.
3. The intelligent ecological teaching device of claim 2, wherein the hand-held mechanism comprises a bellows, one end of the bellows is disposed on the mounting housing, and the other end of the bellows is a tension end.
4. The intelligent ecological teaching device as claimed in claim 3, wherein a placement groove is formed in the mounting housing, the corrugated pipe is arranged in the placement groove, and one end of the corrugated pipe is connected with the inner wall of the placement groove through a detachable component.
5. The intelligent ecological teaching device as claimed in claim 4, wherein the detachable assembly comprises a first pipe and a second pipe, one end of the first pipe is fixed on the inner wall of the placement groove, the other end of the first pipe is in threaded connection with the second pipe, and the second pipe is connected with the corrugated pipe.
6. The intelligent ecological teaching device of claim 3, wherein the tension end is provided with a base, and the base is detachably connected with the corrugated pipe.
7. The intelligent teaching ecology apparatus of claim 1 wherein the smart writing board comprises a touch screen.
8. The intelligent ecological teaching device as claimed in claim 7, wherein the intelligent writing board further comprises a stylus and a control module, the touch screen comprises a writing surface, the touch screen is used for sensing writing operation of the stylus through the writing surface and generating touch coordinate data, the touch screen is connected with the control module, and the control module is used for generating handwriting according to the touch coordinate data.
9. The intelligent ecological teaching device of claim 8, wherein the writing surface is covered with an anti-ultraviolet and anti-blue-light eye-protecting film.
10. The intelligent ecological teaching device according to claim 1, wherein the terminal equipment comprises at least a mobile phone and a second computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122720550.9U CN216053367U (en) | 2021-11-08 | 2021-11-08 | Intelligent teaching ecological device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122720550.9U CN216053367U (en) | 2021-11-08 | 2021-11-08 | Intelligent teaching ecological device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216053367U true CN216053367U (en) | 2022-03-15 |
Family
ID=80552532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122720550.9U Active CN216053367U (en) | 2021-11-08 | 2021-11-08 | Intelligent teaching ecological device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216053367U (en) |
-
2021
- 2021-11-08 CN CN202122720550.9U patent/CN216053367U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202362962U (en) | Wireless multimedia teaching system | |
| KR20170051481A (en) | Touch blackboard, touch blackboard frame, touch all-in-one machine and combined blackboard | |
| CN202758328U (en) | Nanometer interactive electronic white board | |
| CN102881196A (en) | Electronic lecturing system | |
| JP2017037213A (en) | Bi-directional education system and bi-directional education method using the same | |
| CN204965789U (en) | Interactional teaching system | |
| US11550405B2 (en) | Learning support system | |
| CN216053367U (en) | Intelligent teaching ecological device | |
| CN201374129Y (en) | Electronic teaching blackboard realized on the basis of general PC, touch screen and projection system | |
| JP3000347B2 (en) | Educational imaging machine | |
| CN214846669U (en) | Large-size display system | |
| CN206348979U (en) | A kind of tutoring system of use electronic blackboard | |
| CN201285604Y (en) | Multimedia teaching apparatus for combined multifunctional learning machine | |
| KR20000050087A (en) | A lecture system using touch screen | |
| CN210983020U (en) | Blackboard writing projection device for teaching | |
| CN210377886U (en) | Multi-screen touch interactive electronic blackboard | |
| Johnson | Digital ink: In-class annotation of PowerPoint lectures | |
| CN204010362U (en) | E-schoolbag | |
| CN209199364U (en) | A kind of numeral teaching system | |
| Wang et al. | Economical solution for an easy to use interactive whiteboard | |
| KR100425276B1 (en) | Electronic board | |
| CN206236390U (en) | Intelligent panel and intelligent exhibiting device | |
| CN213281986U (en) | Case device suitable for cloud classroom | |
| CN215526965U (en) | Network lesson reading pen capable of writing | |
| CN205080528U (en) | Be suitable for handwriting pad of teaching use |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |