CN206726575U - A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid - Google Patents
A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid Download PDFInfo
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- CN206726575U CN206726575U CN201720365028.4U CN201720365028U CN206726575U CN 206726575 U CN206726575 U CN 206726575U CN 201720365028 U CN201720365028 U CN 201720365028U CN 206726575 U CN206726575 U CN 206726575U
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- bearing seat
- fixed mount
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- theorem
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Abstract
It the utility model is related to a kind of middle-school mathematics teaching apparatus, more particularly to a kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid.The technical problems to be solved in the utility model is to provide a kind of simple to operate, time saving and energy saving, drafting standards and can cause the middle school mathematics theorem of diameter perpendicular to a chord teaching aid of the dense learning interest of classmates.In order to solve the above-mentioned technical problem, the utility model provides such a middle school mathematics theorem of diameter perpendicular to a chord teaching aid, includes fixed mount, base, electric rotating machine, screw mandrel, first bearing seat, second bearing seat, guide pillar, nut, fix bar, guide pin bushing, the first pointer, second pointer etc.；Fixed mount outer bottom is symmetrically welded with base, and the mode being connected by screw in fixed mount is connected with demonstration board.The utility model has reached a kind of simple to operate, time saving and energy saving, drafting standards and can cause the dense learning interest of classmates, improves the learning efficiency of student.
Description
Technical field
A kind of middle-school mathematics teaching apparatus is the utility model is related to, more particularly to a kind of teaching of middle school mathematics theorem of diameter perpendicular to a chord is used
Tool.
Background technology
Mathematics, it is a subject for studying the concepts such as quantity, structure, change, space and information, belongs in terms of certain angle
In one kind of formal science.And in development of human history and social life, mathematics also plays irreplaceable effect, and
Learn and study the essential basic tool of modern science and technology.
Theorem of diameter perpendicular to a chord is a theorem in mathematics geometry (circle), and its popular expression is：Diameter perpendicular to string is put down
Be divided to string and divide equally this string to two arcs.Theorem of diameter perpendicular to a chord is one of round critical nature, and it is to prove line segment, angle phase in circle
Deng the important evidence of, vertical relation, also provided for the calculating in circle, proof and mapping according to, idea and method.
Mathematical education mode now be all Man Graphics professor's knowledge to it is this be all using artificial non intelligent, exist
Waste time and energy and be difficult picture so standard, classmates are also required to spend many energy to learning this, sometimes also very
Find it difficult to learn to thing, therefore need a kind of simple to operate, time saving and energy saving, drafting standards of research and development badly and classmates can be caused dense
The middle school mathematics theorem of diameter perpendicular to a chord teaching aid of learning interest.
Utility model content
(1) technical problems to be solved
The utility model in order to overcome draw it is nonstandard, waste time and energy, it is difficult cause the learning interest of classmates, it is difficult to allow same
Learn the shortcomings that acquiring, the technical problems to be solved in the utility model be to provide it is a kind of it is simple to operate, time saving and energy saving, draw
Standard and the middle school mathematics theorem of diameter perpendicular to a chord teaching aid that the dense learning interest of classmates can be caused.
(2) technical scheme
In order to solve the above-mentioned technical problem, the utility model provides such a middle school mathematics theorem of diameter perpendicular to a chord teaching and used
Tool, include fixed mount, base, electric rotating machine, screw mandrel, first bearing seat, second bearing seat, guide pillar, nut, fix bar, lead
Set, the first pointer, the second pointer, 3rd bearing seat, rotating shaft, disk, scale, demonstration board, rubber blanket and holder, outside fixed mount
Bottom symmetrical is welded with base, and the mode being connected by screw in fixed mount is connected with demonstration board, led on the left of fixed mount inner bottom part
Cross bolted mode and be connected with electric rotating machine, left bottom is welded with first bearing seat, the interior left side of fixed mount in fixed mount
Top is welded with second bearing seat, and first bearing seat in the bearing in second bearing seat by way of interference is connected with being connected with
Screw mandrel, it is connected by way of welding with screw mandrel on the output shaft of electric rotating machine, screw mandrel is provided with nut, and nut is matched somebody with somebody with screw mandrel
Close, the right-hand member of nut is welded with fix bar, and the right-hand member of first bearing seat and second bearing seat is welded with guide pillar, slidingtype on guide pillar
Guide pin bushing is connected with, the Left-side center of guide pin bushing is connected by way of welding with the right-hand member of fix bar, the right center welding of guide pin bushing
There is the first pointer, be connected with 3rd bearing seat by bolted connection on front side of demonstration board right part, welded on 3rd bearing seat
There is a disk, be connected with rotating shaft by way of interference connection in the bearing on 3rd bearing seat, second is welded with front side of rotating shaft
Pointer, the second pointer and the first pointer are used in conjunction with each other.
Preferably, rubber blanket is also included, the mode that rubber blanket is connected by screw is connected to base bottom.
Preferably, holder is also included, holder is welded on the right side of fixed mount inner bottom part.
Preferably, submount material is stainless steel.
Preferably, fixed frame material is Q235 steel.
Preferably, electric rotating machine is servomotor.
Operation principle：When needing to use this equipment, teacher is moved to the place needed to use first, and then teacher is controlled
Electric rotating machine processed is started working, and the output shaft of electric rotating machine drives screw mandrel rotation, and screw mandrel is engaged with nut, when screw mandrel is clockwise
Nut is driven to move downward during rotation, nut, which moves downward, drives fix bar to move downward, and fix bar is connected with guide pin bushing, fix bar
Moving downward and drive guide pin bushing to move downward, guide pin bushing is connected with the first pointer, and guide pin bushing, which moves downward, drives the first pointer to move downward,
When the first pointer is moved downwardly to certain position, teacher controls electric rotating machine to be stopped.It is allowed to be parked in a certain suitable position
Put.Teacher is rotated further by the second pointer, and scale can understand the angle of the second indicators turn, when the second pointer is vertical with the first pointer
When, measure the first pointer divided equally on disk by the second pointer two segment length whether, while also measure by second refer to
Whether arc length corresponding to two sections of the first pointer that pin is divided equally is the same to be verified theorem of diameter perpendicular to a chord with this.Teacher after the completion of first time
Electric rotating machine work is controlled, the first pointer is put down again and a little measured again once.So repeated measurement goes to verify vertical footpath
Theorem.When having used this equipment, teacher controls electric rotating machine to start working, and drives nut upward when screw mandrel rotate counterclockwise
Motion, nut move upwards drive fix bar move upwards, fix bar is connected with guide pin bushing, fix bar move upwards drive guide pin bushing to
Motion, guide pin bushing are connected with the first pointer, and guide pin bushing moves upwards drives the first pointer to move upwards, when the first pointer moves back upwards
During to origin-location, teacher controls electric rotating machine to be stopped.It is placed into original position.
Because including rubber blanket, the mode that rubber blanket is connected by screw is connected to base bottom.Rubber blanket can be very
The good stability for keeping this equipment, the skidding probability of this equipment is reduced, greatly improve the security of this equipment.
Because including holder, holder is welded on the right side of fixed mount inner bottom part.Holder interior energy places the works such as chalk
Tool, facilitate writing on the blackboard work of the teacher in explanation, greatly facilitate teaching, very broad aspect improves efficiency of teaching.
Because submount material is stainless steel, stainless steel corrosion resistance and acid resistance are strong, can extension fixture service life.
Because fixed frame material is Q235 steel, Q235 steel hardness is high, it is not easy to deforms, makes the service life of device longer.
Because electric rotating machine is servomotor, anti-overload ability is strong, and high speed performance is good, can be precisely controlled its rotating speed.
(3) beneficial effect
The utility model has reached a kind of simple to operate, time saving and energy saving, drafting standards and classmates can be caused dense
Learning interest, improves the learning efficiency of student, and rubber blanket can be good at keeping the stability of this equipment to greatly improve this
The security of equipment, holder greatly facilitate teaching, and very broad aspect improves the effect of efficiency of teaching.
Brief description of the drawings
Fig. 1 is the first main structure diagram of the present utility model.
Fig. 2 is second of main structure diagram of the present utility model.
Fig. 3 is the third main structure diagram of the present utility model.
Mark in accompanying drawing for：1- fixed mounts, 2- bases, 3- electric rotating machines, 4- screw mandrels, 5- first bearing seats, 6- second
Bearing block, 7- guide pillars, 8- nuts, 9- fix bars, 10- guide pin bushings, the pointers of 11- first, the pointers of 12- second, 13- 3rd bearing seats,
14- rotating shafts, 15- disks, 16- scales, 17- demonstration boards, 18- rubber blankets, 19- holders.
Embodiment
The utility model is further described with reference to the accompanying drawings and examples.
Embodiment 1
A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid, as Figure 1-3, include fixed mount 1, base 2, electric rotating machine
3rd, screw mandrel 4, first bearing seat 5, second bearing seat 6, guide pillar 7, nut 8, fix bar 9, guide pin bushing 10, the first pointer 11, second refer to
Pin 12,3rd bearing seat 13, rotating shaft 14, disk 15, scale 16, demonstration board 17, rubber blanket 18 and holder 19, outside fixed mount 1
Bottom symmetrical is welded with base 2, and the mode being connected by screw in fixed mount 1 is connected with demonstration board 17, and the inner bottom part of fixed mount 1 is left
Side is connected with electric rotating machine 3 by bolted connection, and left bottom is welded with first bearing seat 5, fixed mount in fixed mount 1
Left side top is welded with second bearing seat 6 in 1, and first bearing seat 5 by interference with being connected in the bearing in second bearing seat 6
Mode is connected with screw mandrel 4, is connected on the output shaft of electric rotating machine 3 by way of welding with screw mandrel 4, and screw mandrel 4 is provided with nut
8, nut 8 coordinates with screw mandrel 4, and the right-hand member of nut 8 is welded with fix bar 9, and the right-hand member of first bearing seat 5 and second bearing seat 6 welds
Be connected to guide pillar 7, slidingtype is connected with guide pin bushing 10 on guide pillar 7, the Left-side center of guide pin bushing 10 by way of welding with fix bar 9
Right-hand member is connected, and the right center of guide pin bushing 10 is welded with the first pointer 11, and the right part of demonstration board 17 front side is by bolted connection
3rd bearing seat 13 is connected with, is welded with disk 15 on 3rd bearing seat 13, passes through interference in the bearing on 3rd bearing seat 13
The mode of connection is connected with rotating shaft 14, and the front side of rotating shaft 14 is welded with the second pointer 12, the second pointer 12 and the phase of the first pointer 11
Mutually it is used cooperatively.
Embodiment 2
A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid, as Figure 1-3, include fixed mount 1, base 2, electric rotating machine
3rd, screw mandrel 4, first bearing seat 5, second bearing seat 6, guide pillar 7, nut 8, fix bar 9, guide pin bushing 10, the first pointer 11, second refer to
Pin 12,3rd bearing seat 13, rotating shaft 14, disk 15, scale 16, demonstration board 17, rubber blanket 18 and holder 19, outside fixed mount 1
Bottom symmetrical is welded with base 2, and the mode being connected by screw in fixed mount 1 is connected with demonstration board 17, and the inner bottom part of fixed mount 1 is left
Side is connected with electric rotating machine 3 by bolted connection, and left bottom is welded with first bearing seat 5, fixed mount in fixed mount 1
Left side top is welded with second bearing seat 6 in 1, and first bearing seat 5 by interference with being connected in the bearing in second bearing seat 6
Mode is connected with screw mandrel 4, is connected on the output shaft of electric rotating machine 3 by way of welding with screw mandrel 4, and screw mandrel 4 is provided with nut
8, nut 8 coordinates with screw mandrel 4, and the right-hand member of nut 8 is welded with fix bar 9, and the right-hand member of first bearing seat 5 and second bearing seat 6 welds
Be connected to guide pillar 7, slidingtype is connected with guide pin bushing 10 on guide pillar 7, the Left-side center of guide pin bushing 10 by way of welding with fix bar 9
Right-hand member is connected, and the right center of guide pin bushing 10 is welded with the first pointer 11, and the right part of demonstration board 17 front side is by bolted connection
3rd bearing seat 13 is connected with, is welded with disk 15 on 3rd bearing seat 13, passes through interference in the bearing on 3rd bearing seat 13
The mode of connection is connected with rotating shaft 14, and the front side of rotating shaft 14 is welded with the second pointer 12, the second pointer 12 and the phase of the first pointer 11
Mutually it is used cooperatively.
Also include rubber blanket 18, the mode that rubber blanket 18 is connected by screw is connected to the bottom of base 2.
Embodiment 3
A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid, as Figure 1-3, include fixed mount 1, base 2, electric rotating machine
3rd, screw mandrel 4, first bearing seat 5, second bearing seat 6, guide pillar 7, nut 8, fix bar 9, guide pin bushing 10, the first pointer 11, second refer to
Pin 12,3rd bearing seat 13, rotating shaft 14, disk 15, scale 16, demonstration board 17, rubber blanket 18 and holder 19, outside fixed mount 1
Bottom symmetrical is welded with base 2, and the mode being connected by screw in fixed mount 1 is connected with demonstration board 17, and the inner bottom part of fixed mount 1 is left
Side is connected with electric rotating machine 3 by bolted connection, and left bottom is welded with first bearing seat 5, fixed mount in fixed mount 1
Left side top is welded with second bearing seat 6 in 1, and first bearing seat 5 by interference with being connected in the bearing in second bearing seat 6
Mode is connected with screw mandrel 4, is connected on the output shaft of electric rotating machine 3 by way of welding with screw mandrel 4, and screw mandrel 4 is provided with nut
8, nut 8 coordinates with screw mandrel 4, and the right-hand member of nut 8 is welded with fix bar 9, and the right-hand member of first bearing seat 5 and second bearing seat 6 welds
Be connected to guide pillar 7, slidingtype is connected with guide pin bushing 10 on guide pillar 7, the Left-side center of guide pin bushing 10 by way of welding with fix bar 9
Right-hand member is connected, and the right center of guide pin bushing 10 is welded with the first pointer 11, and the right part of demonstration board 17 front side is by bolted connection
3rd bearing seat 13 is connected with, is welded with disk 15 on 3rd bearing seat 13, passes through interference in the bearing on 3rd bearing seat 13
The mode of connection is connected with rotating shaft 14, and the front side of rotating shaft 14 is welded with the second pointer 12, the second pointer 12 and the phase of the first pointer 11
Mutually it is used cooperatively.
Also include rubber blanket 18, the mode that rubber blanket 18 is connected by screw is connected to the bottom of base 2.
Also include holder 19, holder 19 is welded on the right side of the inner bottom part of fixed mount 1.
Embodiment 4
A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid, as Figure 1-3, include fixed mount 1, base 2, electric rotating machine
3rd, screw mandrel 4, first bearing seat 5, second bearing seat 6, guide pillar 7, nut 8, fix bar 9, guide pin bushing 10, the first pointer 11, second refer to
Pin 12,3rd bearing seat 13, rotating shaft 14, disk 15, scale 16, demonstration board 17, rubber blanket 18 and holder 19, outside fixed mount 1
Bottom symmetrical is welded with base 2, and the mode being connected by screw in fixed mount 1 is connected with demonstration board 17, and the inner bottom part of fixed mount 1 is left
Side is connected with electric rotating machine 3 by bolted connection, and left bottom is welded with first bearing seat 5, fixed mount in fixed mount 1
Left side top is welded with second bearing seat 6 in 1, and first bearing seat 5 by interference with being connected in the bearing in second bearing seat 6
Mode is connected with screw mandrel 4, is connected on the output shaft of electric rotating machine 3 by way of welding with screw mandrel 4, and screw mandrel 4 is provided with nut
8, nut 8 coordinates with screw mandrel 4, and the right-hand member of nut 8 is welded with fix bar 9, and the right-hand member of first bearing seat 5 and second bearing seat 6 welds
Be connected to guide pillar 7, slidingtype is connected with guide pin bushing 10 on guide pillar 7, the Left-side center of guide pin bushing 10 by way of welding with fix bar 9
Right-hand member is connected, and the right center of guide pin bushing 10 is welded with the first pointer 11, and the right part of demonstration board 17 front side is by bolted connection
3rd bearing seat 13 is connected with, is welded with disk 15 on 3rd bearing seat 13, passes through interference in the bearing on 3rd bearing seat 13
The mode of connection is connected with rotating shaft 14, and the front side of rotating shaft 14 is welded with the second pointer 12, the second pointer 12 and the phase of the first pointer 11
Mutually it is used cooperatively.
Also include rubber blanket 18, the mode that rubber blanket 18 is connected by screw is connected to the bottom of base 2.
Also include holder 19, holder 19 is welded on the right side of the inner bottom part of fixed mount 1.
The material of base 2 is stainless steel.
The material of fixed mount 1 is Q235 steel.
Electric rotating machine 3 is servomotor.
Operation principle：When needing to use this equipment, teacher is moved to the place needed to use first, and then teacher is controlled
Electric rotating machine 3 processed is started working, and the output shaft of electric rotating machine 3 drives screw mandrel 4 to rotate, and screw mandrel 4 is engaged with nut 8, when screw mandrel 4
Nut 8 is driven to move downward when turning clockwise, nut 8, which moves downward, drives fix bar 9 to move downward, fix bar 9 and guide pin bushing
10 are connected, and fix bar 9, which moves downward, drives guide pin bushing 10 to move downward, and guide pin bushing 10 is connected with the first pointer 11, and guide pin bushing 10 is transported downwards
Dynamic to drive the first pointer 11 to move downward, when the first pointer 11 is moved downwardly to certain position, teacher controls electric rotating machine 3 to stop
Only work.It is allowed to be parked in a certain suitable position.Teacher is rotated further by the second pointer 12, and scale 16 can understand 12 turns of the second pointer
Dynamic angle, when the second pointer 12 is vertical with the first pointer 11, measure first divided equally on disk 15 by the second pointer 12
Whether two segment length of pointer 11, while also measures corresponding to two sections of the first pointer 11 divided equally by the second pointer 12
Whether arc length is the same to be verified theorem of diameter perpendicular to a chord with this.Teacher controls electric rotating machine 3 to work after the completion of first time, by the first pointer 11
Put down and a little measure again once again.So repeated measurement goes to verify theorem of diameter perpendicular to a chord.When having used this equipment, teacher's control
Electric rotating machine 3 processed is started working, and drives nut 8 to move upwards when 4 rotate counterclockwise of screw mandrel, and motion drives admittedly nut 8 upwards
Fixed pole 9 is moved upwards, and fix bar 9 is connected with guide pin bushing 10, and motion drives guide pin bushing 10 to motion to fix bar 9 upwards, guide pin bushing 10 and the
One pointer 11 is connected, and motion drives the first pointer 11 to move upwards to guide pin bushing 10 upwards, when the first pointer 11 moves back into original upwards
When coming position, teacher controls electric rotating machine 3 to be stopped.It is placed into original position.
Because including rubber blanket 18, the mode that rubber blanket 18 is connected by screw is connected to the bottom of base 2.Rubber blanket 18
It can be good at keeping the stability of this equipment, reduce the skidding probability of this equipment, greatly improve the safety of this equipment
Property.
Because including holder 19, holder 19 is welded on the right side of the inner bottom part of fixed mount 1.The interior energy of holder 19 places powder
The instruments such as pen, facilitate writing on the blackboard work of the teacher in explanation, greatly facilitate teaching, very broad aspect improves teaching effect
Rate.
Because the material of base 2 is stainless steel, stainless steel corrosion resistance and acid resistance are strong, can extension fixture service life.
Because the material of fixed mount 1 is Q235 steel, Q235 steel hardness is high, it is not easy to deforms, makes the service life of device longer.
Because electric rotating machine 3 is servomotor, anti-overload ability is strong, and high speed performance is good, can be precisely controlled its rotating speed.
Embodiment described above only expresses preferred embodiment of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to the utility model patent scope.It should be pointed out that for the common of this area
For technical staff, without departing from the inventive concept of the premise, some deformations can also be made, improves and substitutes, these are all
Belong to the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (6)
1. a kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid, it is characterised in that include fixed mount (1), base (2), electric rotating
Machine (3), screw mandrel (4), first bearing seat (5), second bearing seat (6), guide pillar (7), nut (8), fix bar (9), guide pin bushing (10),
First pointer (11), the second pointer (12), 3rd bearing seat (13), rotating shaft (14), disk (15), scale (16), demonstration board
(17), rubber blanket (18) and holder (19), fixed mount (1) outer bottom are symmetrically welded with base (2), passed through in fixed mount (1)
The mode of mode connects for screw is connected with demonstration board (17), and fixed mount (1) inner bottom part passes on left bolted mode and is connected with rotation
Rotating motor (3), fixed mount (1) interior left bottom are welded with first bearing seat (5), and fixed mount (1) interior left side top is welded with
Two bearing bracket (6), first bearing seat (5) by way of interference is connected in the bearing in second bearing seat (6) with being connected with silk
Bar (4), it is connected by way of welding with screw mandrel (4) on the output shaft of electric rotating machine (3), screw mandrel (4) is provided with nut (8),
Nut (8) coordinates with screw mandrel (4), and the right-hand member of nut (8) is welded with fix bar (9), first bearing seat (5) and second bearing seat
(6) right-hand member is welded with guide pillar (7), and slidingtype is connected with guide pin bushing (10) on guide pillar (7), and the Left-side center of guide pin bushing (10) passes through weldering
The mode connect is connected with the right-hand member of fix bar (9), and the right center of guide pin bushing (10) is welded with the first pointer (11), demonstration board (17)
3rd bearing seat (13) is connected with by bolted connection on front side of right part, and 3rd bearing seat is welded with disk on (13)
(15) rotating shaft (14), the front side of rotating shaft (14), are connected with by way of interference connection in the bearing on 3rd bearing seat (13)
The second pointer (12) is welded with, the second pointer (12) and the first pointer (11) are used in conjunction with each other.
2. a kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid according to claim 1, it is characterised in that also include rubber
Pad (18), the mode that rubber blanket (18) is connected by screw is connected to base (2) bottom.
3. a kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid according to claim 2, it is characterised in that also include placement
Box (19), holder (19) are welded on the right side of fixed mount (1) inner bottom part.
A kind of 4. middle school mathematics theorem of diameter perpendicular to a chord teaching aid according to claim 3, it is characterised in that base (2) material
For stainless steel.
A kind of 5. middle school mathematics theorem of diameter perpendicular to a chord teaching aid according to claim 4, it is characterised in that fixed mount (1) material
Expect for Q235 steel.
A kind of 6. middle school mathematics theorem of diameter perpendicular to a chord teaching aid according to claim 5, it is characterised in that electric rotating machine (3)
For servomotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720365028.4U CN206726575U (en) | 2017-04-10 | 2017-04-10 | A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720365028.4U CN206726575U (en) | 2017-04-10 | 2017-04-10 | A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206726575U true CN206726575U (en) | 2017-12-08 |
Family
ID=60504445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720365028.4U Expired - Fee Related CN206726575U (en) | 2017-04-10 | 2017-04-10 | A kind of middle school mathematics theorem of diameter perpendicular to a chord teaching aid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206726575U (en) |
-
2017
- 2017-04-10 CN CN201720365028.4U patent/CN206726575U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171208 Termination date: 20190410 |
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| CF01 | Termination of patent right due to non-payment of annual fee |