CA2037312A1 - Page turner - Google Patents
Page turnerInfo
- Publication number
- CA2037312A1 CA2037312A1 CA 2037312 CA2037312A CA2037312A1 CA 2037312 A1 CA2037312 A1 CA 2037312A1 CA 2037312 CA2037312 CA 2037312 CA 2037312 A CA2037312 A CA 2037312A CA 2037312 A1 CA2037312 A1 CA 2037312A1
- Authority
- CA
- Canada
- Prior art keywords
- page
- book
- turner
- magazine
- turning
- 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.)
- Abandoned
Links
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- Tables And Desks Characterized By Structural Shape (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to a new page turner for automatically turning pages in a book, magazine or the like. The page turner is capable of turning a single page at a time and is simple and efficient in design and operation. By being able to turn a single page at a time the drawbacks of the prior art have effectively been overcome. The page turner uses a releasable adhesive to contact the page to be turned, to lift same and then swings an operational arm between the lifted page and the book thereby turning the page.
This invention relates to a new page turner for automatically turning pages in a book, magazine or the like. The page turner is capable of turning a single page at a time and is simple and efficient in design and operation. By being able to turn a single page at a time the drawbacks of the prior art have effectively been overcome. The page turner uses a releasable adhesive to contact the page to be turned, to lift same and then swings an operational arm between the lifted page and the book thereby turning the page.
Description
2~373~
BAC~GRO~ND OF T~ INVENTIO~
1. Field of the Invention This invention relates generall~ to a page turner and more particularly, to a novel page turner which is capable of turning a single page at a time in response to activation. The device is particularly useful as it can turn the page in either direction and consistently turns a single page upon activation.
2. Description of the Prior Art There is a very clear and defined need for a page turner which operates efficiently and easily in both directions. Today, society itself encourages and almost demands independence from its members which is a most difficult task for the disabled, handicapped or the elderly. This independence demanded by society is very much dependent on the use and control of the arms of the body which unfortunately is not possible for a growing number of persons in society. Thus, these persons are directly deprived of a major source of education and entertainment.
An efficient device capable of turning pages of books, magazines and the like allows these persons to 203~312 directly increase their independence and improve their participation in society.
Several attempts have been made in the past to invent such a device and we have examined two of the more popular models available. These page turners on the market have demonstrated limited ability.
One of the prior art devices is the CR
Reversible Touch Turner made by Touch Turner of Washington, U.S.A.. This device utilizes the principle of friction to move a page and uses a high friction roller pressed against a page. The roller is then rotated causing the page to turn in the desired direction. One of the difficulties with this device is that more than one page may turn under the roller at one time. Also, this device does not deal well with the problem of books which do not lie flat on their own. In these cases, the spines of the books must be broken continuously and repeatedly thereby destroying the book. The fact that there is no mechanism to prevent pages to flip on their own accord provides a source of unreliability.
Another attempt to solve these proble~s is the GEWA BLV/6 made by Gewa ~ehabteknik AB of Sweden. This device also uses a hig'n friction roller to turn pages in response to activation and suffers from the same drawbacks. This device also uses plexiglass to hold the 2~373~ ~
book flat and to prevent unwanted page turns. The problem with this is that the plexiglass i5 a constant source of glare and an annoying barrier between the reader and the words. A further drawback of this device is that the user interface is difficult to use because the user must participate actively in the process of turning a page by controlling four motions of the moveable roller. The problem is that the order of the motions of the rollers to institute a page flip are not fixed.
SUMMARY OF_UE INVENTION
Accordingly, it is an object of the present invention to at least partially overcome these disadvantages by providing a novel page turning device which allows a user to turn a single page in either direction in an efficient and simple manner.
It is a further object of the present invention to provide a novel page turner which is simple to operate.
A further object of the invention is to provide a page turner which will turn a single page upon activation.
A still further object of the invention is to provide a novel page turner which will not damage the book or magazine while in use.
2~3~312 A further object of the invention is to provide a page turner which is easily used by the disabled and the handicapped.
To this end, in one of its aspects, the invention provides a a page turner for turning a page of a book, magazine or the like, said turner comprising a support for supporting the book, magazine or the like in an open position, a retaining means for retaining the pages in a readable position, a page lifting means adapted to releasable lift a single page at a corner, a page turning means adapted to be inserted between the lifted page and the remaining pages and to turn said lifted page.
Further objects of the invention will be apparent from the following description taken in conjunction with the following drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of the page turner in accordance with the present invention.
Figure 2 is a perspective view of the page corner lifter as shown in figure 1.
Figures 3a to 3f is a series of drawings showing a sequential page turning operation.
s 2~37312 Figures 4a to ~d is a series of drawings showing the operation of the page corner lifter during a page turning operation.
Figures 5a to 5c is an end view of the book holder during a page turning operation.
DESCRIPTION OF THE PREFERRED EHBODI~ENT
The act of turning a page automatically and the resulting device for doing so is a classic design problem. In making this invention, we have attempted to consider all the drawbacks of the commercially available products and problems expressed to us by the users of these devices. By way of illustration only, the structure and operation of this device will be explained with reference to a book. However, it is to be understood that this device is equal y applicable to any type of book, magazine or the like which requires pages to be turned.
Our method and the resulting device is based on the isolation of a single page prior to the turning or flipping operation in order to prevent or reduce the chances of two pages being turned at the same time.
In order to do this, we preferable lift the corner of the page to be turned by using a suitable adhesive commonly referred to as a stick/non-stick 203731~
adhesive. This type of adhesive i8 similar to that found on the 3M (Trade Mark) Post-It (Trade Mark) note and paper. After the lifting of the single page by contact with the corner lifter, a rod is then swung in an arc underneath the lifted, single page, across the book thus flipping the page. In a simple compacison, this is similar to the act of lifting the corner of a page by a finger of the hand and then pushing the page across by the use of the fingers of the hand.
We have also eliminated the drawbacks of the plexiglass of the GEWA BLV/6 device since we use a thin, !:
invisible wire to hold the surface of the book flat.
Referring now to the drawings, there is shown in figure 1, a perspective view of a device of this invention. The device in the preferred embodiment, comprises a platform 25 upon which the book 2 (not shown) is placed. The area covered by the book 2 is shown in dotted lines 27. The platform 25 may be covered by any material esthetically pleasing. This may be for exa~ple, coloured glass, opaque glass or wood or wood venear. The book 2 is then positioned in placed and retaining means 28 are placed over the inside cover of the book 2 to hold the book 2 in place. ~hese retaining means 28 are preferably transparent plexiglass flaps which are spring hinged at the top which serve to hold the inside flaps of the book 2 securely to prevent lateral motion. The bottom of the book 2 is supported by bar 35 which may be locked into place by lock 39. Lock 39 may be loosened to move bar 35 along recessed track 36 which is dovetailed in shape to prevent bar 35 from being lifted vertically, and then tightened when positioned in order to accommodate books of different siæes.
Rod 1 is secured at one end of the section la to U-bracket 29 by a short metal rod 30 passing through the end of rod la. The opposite end lb of rod 1 is made of a very flexible material such as a thin Teflon (Trade Mark) material such that when it is pressed up against a page of a book, it will bend so that there is maximal surface contact with the page. The rod 1 is free to rotate about rod 30 and is driven by motor 31 which is placed beneath platform 25 which enables the rod 1 to swing across the book 2.
Guides 34,38 are provided in tracks 33,37 which allow the guides 34,38 to slide laterally. These guides 34,38 are shaped so that the outside slopes are steeper than the inside slopes. Guide 6 is fastened to the platform 25 and is centered about an imaginary line drawn from recessed track 36 to motor 31.
Each page corner lifter is supported by support 14 in which is journalled rod 32. The structure and ~ 8 2~373~
operation will be explained in more detail hereinafter.
Coarsely threaded rods 15, 16 are mounted on identical DC motors 26 mounted beneath platform 25. A
thin, transparent wire 4 extends between nuts 17, 18 which are threaded on rods 15, 16. Preferably, rods 15, 16 are coil rods which have a coarseness of 4.5 threads per inch. This degree of coarseness is preferred to move the wire 4 at a sufficient speed for the device to operate optimally.
Referring now to figure 2, there will now be made an explanation of the page corner lifter. This device lifts the corner of the page upon activation to a sufficient height to enable the page flipping rod 1 to position itself.
The main arm 3 may be made from a stiff material such as stiff aluminium and is bent at an angle of about 60 degrees. At the bend, a hollow metal cylinder 21 is fastened and a small metal rod 20 projects from the support 14 through the cylinder 21. Another small metal rod 22 is provided which serves as a stop for the arm 3 limiting its maximum height. Metal spring 9 is provided which urges and returns the arm 3 to its initial position if arm 3 is rotated about the rod 21.
With reference to figures 3a to 3f, the operation of the device will now be explained. In the `` ` 9 2Q37~1~
rest position as shown in figure 3a, the book 2 i5 open at a selected page which is held in in the "resting position. As seen in this drawing, the book 2 is open to the desired page and the wire 4 retains the page in an easily to be read position.
When the user desires to turn the page, the rod 1 is swung in an arc, counter-clockwise across the book 2 as shown in figure 3b. As the rod 1 swings across, it follows guide 5 as shown in figure 3a so as to rest on top of the facing pages. Guide 6 prevents the rod 1 from falling into the centre of thick books. After rod 1 moves past the book 2, it contacts the arm 3 of the page corner lifter as shown in more detail in figures 4a to 4d. At the end of this travel as shown in figure 3c, the rod 1 reverses direction and is forced into position by guide 7. This position is underneath the single page which has now been lifted by the page corner lifter and above the rest of the pages. At this point, wire 4 begins to rise allowing the page the freedom to turn. Figure 3e shows the rod 1 near the centre of the book and figure 3f shows the page almost flipped over. The rod 1 begins to descend as the book returns to the reading position as shown in figure 3a.
Figure 4a to 4d shows the action of the lifting of a single page. Figure 4a shows the device in the --' 10 2n3~33L~
resting stage. In this stage, the device is out of the way far enough not to interfere with the reading of the book or any individual page thereof.
As rod 1 moves, it contacts the arm 3 rotating it around the smaller rod 20. The metal spring extends and the adhesive 8 touches the page. Because of the connection by string 13 of the lower jaw 11 and the holder 14, the lower jaw 11 is pressed flat against the book 2 as shown in figure 4b. The soft rubber 12 depresses slightly in response to the rotational movement caused by the rod 1. This depression maximizes the contact surface of the adhesive 8.
The rod 1 now reverses direction and the spring 9 is returned to the state of equilibrium, reorienting the page control lifter to the original position.
In this case, the adhesive 8 has contacted a single page 19 and separates it from the rest of the pages. The rod follows the guide 7 and is placed between the lifted page and the rest of the book as shown in figure 4c. As a result of the specific adhesive used, the page easily separates itself from the adhesive 8 when the rod 1 gently pulls on it.
As shown in figures 5a to 5c, the motion of the book holding wire 4 is illustrated during a page flip. In the resting position as shown in figure 5a, the wire holds 2~373~2 the book flat. Rod 1 can traverse across the book without interfering with wire 4 since at the maximum extent of the rod 1, it cannot reach the wire 4. As soon as the rod 1 has been placed between the separated page 19 and the rest of the book 2, the nuts 17, 18 begin to rise thereby raising the wire 4. This is caused by the simultaneous activation of the motors 26 that rotate the threaded rods 15, 16.
The page can also be flipped in the opposite direction to that shown by merely reversing the process.
Since the device is symmetrical, the page can be flipped or turned in both directions.
While the foregoing disclosure illustrates and describes a preferred embodiment of the invention, it is to be understood that it is not so restricted.
BAC~GRO~ND OF T~ INVENTIO~
1. Field of the Invention This invention relates generall~ to a page turner and more particularly, to a novel page turner which is capable of turning a single page at a time in response to activation. The device is particularly useful as it can turn the page in either direction and consistently turns a single page upon activation.
2. Description of the Prior Art There is a very clear and defined need for a page turner which operates efficiently and easily in both directions. Today, society itself encourages and almost demands independence from its members which is a most difficult task for the disabled, handicapped or the elderly. This independence demanded by society is very much dependent on the use and control of the arms of the body which unfortunately is not possible for a growing number of persons in society. Thus, these persons are directly deprived of a major source of education and entertainment.
An efficient device capable of turning pages of books, magazines and the like allows these persons to 203~312 directly increase their independence and improve their participation in society.
Several attempts have been made in the past to invent such a device and we have examined two of the more popular models available. These page turners on the market have demonstrated limited ability.
One of the prior art devices is the CR
Reversible Touch Turner made by Touch Turner of Washington, U.S.A.. This device utilizes the principle of friction to move a page and uses a high friction roller pressed against a page. The roller is then rotated causing the page to turn in the desired direction. One of the difficulties with this device is that more than one page may turn under the roller at one time. Also, this device does not deal well with the problem of books which do not lie flat on their own. In these cases, the spines of the books must be broken continuously and repeatedly thereby destroying the book. The fact that there is no mechanism to prevent pages to flip on their own accord provides a source of unreliability.
Another attempt to solve these proble~s is the GEWA BLV/6 made by Gewa ~ehabteknik AB of Sweden. This device also uses a hig'n friction roller to turn pages in response to activation and suffers from the same drawbacks. This device also uses plexiglass to hold the 2~373~ ~
book flat and to prevent unwanted page turns. The problem with this is that the plexiglass i5 a constant source of glare and an annoying barrier between the reader and the words. A further drawback of this device is that the user interface is difficult to use because the user must participate actively in the process of turning a page by controlling four motions of the moveable roller. The problem is that the order of the motions of the rollers to institute a page flip are not fixed.
SUMMARY OF_UE INVENTION
Accordingly, it is an object of the present invention to at least partially overcome these disadvantages by providing a novel page turning device which allows a user to turn a single page in either direction in an efficient and simple manner.
It is a further object of the present invention to provide a novel page turner which is simple to operate.
A further object of the invention is to provide a page turner which will turn a single page upon activation.
A still further object of the invention is to provide a novel page turner which will not damage the book or magazine while in use.
2~3~312 A further object of the invention is to provide a page turner which is easily used by the disabled and the handicapped.
To this end, in one of its aspects, the invention provides a a page turner for turning a page of a book, magazine or the like, said turner comprising a support for supporting the book, magazine or the like in an open position, a retaining means for retaining the pages in a readable position, a page lifting means adapted to releasable lift a single page at a corner, a page turning means adapted to be inserted between the lifted page and the remaining pages and to turn said lifted page.
Further objects of the invention will be apparent from the following description taken in conjunction with the following drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of the page turner in accordance with the present invention.
Figure 2 is a perspective view of the page corner lifter as shown in figure 1.
Figures 3a to 3f is a series of drawings showing a sequential page turning operation.
s 2~37312 Figures 4a to ~d is a series of drawings showing the operation of the page corner lifter during a page turning operation.
Figures 5a to 5c is an end view of the book holder during a page turning operation.
DESCRIPTION OF THE PREFERRED EHBODI~ENT
The act of turning a page automatically and the resulting device for doing so is a classic design problem. In making this invention, we have attempted to consider all the drawbacks of the commercially available products and problems expressed to us by the users of these devices. By way of illustration only, the structure and operation of this device will be explained with reference to a book. However, it is to be understood that this device is equal y applicable to any type of book, magazine or the like which requires pages to be turned.
Our method and the resulting device is based on the isolation of a single page prior to the turning or flipping operation in order to prevent or reduce the chances of two pages being turned at the same time.
In order to do this, we preferable lift the corner of the page to be turned by using a suitable adhesive commonly referred to as a stick/non-stick 203731~
adhesive. This type of adhesive i8 similar to that found on the 3M (Trade Mark) Post-It (Trade Mark) note and paper. After the lifting of the single page by contact with the corner lifter, a rod is then swung in an arc underneath the lifted, single page, across the book thus flipping the page. In a simple compacison, this is similar to the act of lifting the corner of a page by a finger of the hand and then pushing the page across by the use of the fingers of the hand.
We have also eliminated the drawbacks of the plexiglass of the GEWA BLV/6 device since we use a thin, !:
invisible wire to hold the surface of the book flat.
Referring now to the drawings, there is shown in figure 1, a perspective view of a device of this invention. The device in the preferred embodiment, comprises a platform 25 upon which the book 2 (not shown) is placed. The area covered by the book 2 is shown in dotted lines 27. The platform 25 may be covered by any material esthetically pleasing. This may be for exa~ple, coloured glass, opaque glass or wood or wood venear. The book 2 is then positioned in placed and retaining means 28 are placed over the inside cover of the book 2 to hold the book 2 in place. ~hese retaining means 28 are preferably transparent plexiglass flaps which are spring hinged at the top which serve to hold the inside flaps of the book 2 securely to prevent lateral motion. The bottom of the book 2 is supported by bar 35 which may be locked into place by lock 39. Lock 39 may be loosened to move bar 35 along recessed track 36 which is dovetailed in shape to prevent bar 35 from being lifted vertically, and then tightened when positioned in order to accommodate books of different siæes.
Rod 1 is secured at one end of the section la to U-bracket 29 by a short metal rod 30 passing through the end of rod la. The opposite end lb of rod 1 is made of a very flexible material such as a thin Teflon (Trade Mark) material such that when it is pressed up against a page of a book, it will bend so that there is maximal surface contact with the page. The rod 1 is free to rotate about rod 30 and is driven by motor 31 which is placed beneath platform 25 which enables the rod 1 to swing across the book 2.
Guides 34,38 are provided in tracks 33,37 which allow the guides 34,38 to slide laterally. These guides 34,38 are shaped so that the outside slopes are steeper than the inside slopes. Guide 6 is fastened to the platform 25 and is centered about an imaginary line drawn from recessed track 36 to motor 31.
Each page corner lifter is supported by support 14 in which is journalled rod 32. The structure and ~ 8 2~373~
operation will be explained in more detail hereinafter.
Coarsely threaded rods 15, 16 are mounted on identical DC motors 26 mounted beneath platform 25. A
thin, transparent wire 4 extends between nuts 17, 18 which are threaded on rods 15, 16. Preferably, rods 15, 16 are coil rods which have a coarseness of 4.5 threads per inch. This degree of coarseness is preferred to move the wire 4 at a sufficient speed for the device to operate optimally.
Referring now to figure 2, there will now be made an explanation of the page corner lifter. This device lifts the corner of the page upon activation to a sufficient height to enable the page flipping rod 1 to position itself.
The main arm 3 may be made from a stiff material such as stiff aluminium and is bent at an angle of about 60 degrees. At the bend, a hollow metal cylinder 21 is fastened and a small metal rod 20 projects from the support 14 through the cylinder 21. Another small metal rod 22 is provided which serves as a stop for the arm 3 limiting its maximum height. Metal spring 9 is provided which urges and returns the arm 3 to its initial position if arm 3 is rotated about the rod 21.
With reference to figures 3a to 3f, the operation of the device will now be explained. In the `` ` 9 2Q37~1~
rest position as shown in figure 3a, the book 2 i5 open at a selected page which is held in in the "resting position. As seen in this drawing, the book 2 is open to the desired page and the wire 4 retains the page in an easily to be read position.
When the user desires to turn the page, the rod 1 is swung in an arc, counter-clockwise across the book 2 as shown in figure 3b. As the rod 1 swings across, it follows guide 5 as shown in figure 3a so as to rest on top of the facing pages. Guide 6 prevents the rod 1 from falling into the centre of thick books. After rod 1 moves past the book 2, it contacts the arm 3 of the page corner lifter as shown in more detail in figures 4a to 4d. At the end of this travel as shown in figure 3c, the rod 1 reverses direction and is forced into position by guide 7. This position is underneath the single page which has now been lifted by the page corner lifter and above the rest of the pages. At this point, wire 4 begins to rise allowing the page the freedom to turn. Figure 3e shows the rod 1 near the centre of the book and figure 3f shows the page almost flipped over. The rod 1 begins to descend as the book returns to the reading position as shown in figure 3a.
Figure 4a to 4d shows the action of the lifting of a single page. Figure 4a shows the device in the --' 10 2n3~33L~
resting stage. In this stage, the device is out of the way far enough not to interfere with the reading of the book or any individual page thereof.
As rod 1 moves, it contacts the arm 3 rotating it around the smaller rod 20. The metal spring extends and the adhesive 8 touches the page. Because of the connection by string 13 of the lower jaw 11 and the holder 14, the lower jaw 11 is pressed flat against the book 2 as shown in figure 4b. The soft rubber 12 depresses slightly in response to the rotational movement caused by the rod 1. This depression maximizes the contact surface of the adhesive 8.
The rod 1 now reverses direction and the spring 9 is returned to the state of equilibrium, reorienting the page control lifter to the original position.
In this case, the adhesive 8 has contacted a single page 19 and separates it from the rest of the pages. The rod follows the guide 7 and is placed between the lifted page and the rest of the book as shown in figure 4c. As a result of the specific adhesive used, the page easily separates itself from the adhesive 8 when the rod 1 gently pulls on it.
As shown in figures 5a to 5c, the motion of the book holding wire 4 is illustrated during a page flip. In the resting position as shown in figure 5a, the wire holds 2~373~2 the book flat. Rod 1 can traverse across the book without interfering with wire 4 since at the maximum extent of the rod 1, it cannot reach the wire 4. As soon as the rod 1 has been placed between the separated page 19 and the rest of the book 2, the nuts 17, 18 begin to rise thereby raising the wire 4. This is caused by the simultaneous activation of the motors 26 that rotate the threaded rods 15, 16.
The page can also be flipped in the opposite direction to that shown by merely reversing the process.
Since the device is symmetrical, the page can be flipped or turned in both directions.
While the foregoing disclosure illustrates and describes a preferred embodiment of the invention, it is to be understood that it is not so restricted.
Claims (9)
1. A page turner for turning a page of a book, magazine or the like, said turner comprising a support for supporting the book, magazine or the like in an open position, a retaining means for retaining the pages in a readable position, a page lifting means adapted to releasable lift a single page at a corner, a page turning means adapted to be inserted between the lifted page and the remaining pages and to turn said lifted page.
2. A page turner as claimed in claim 1 wherein said page lifting means comprises a stick/non-stick adhesive on the end of a moveable arm, said arm adapted to contact the page to be turned thus causing said adhesive to contact the to be turned page, and then to be lifted away from said book, magazine or the like.
3. A page turner as claimed in claim 1 wherein said retaining means is a thin wire extending across the open pages of said book, magazine or the like.
4. A page turner as claimed in claim 1 wherein said book is releasably secured to said support.
5. A page turner as claimed in claim 4 wherein said book is secured to said support by a pair of fingers secured to said support and which releasably engage the cover of said book, magazine or the like.
6. A page turner as claimed in claim 3 wherein said wire is moveable into a position of contact with said open pages to a position not in contact with said open pages.
7. A page turner as claimed in claim 1 wherein said page turner means comprises an arm adapted to arc across the open book, magazine and the like, from a resting position upon activation, and to engage the undersurface of the single page after said single page has been lifted, and then to arc back towards the resting position thus turning the page.
8. A page turner as claimed in claim 3 wherein said page turner means comprises an arm adapted to arc across the open book, magazine and the like, from a resting position upon activation, and to engage the undersurface of the single page after said single page has been lifted, and then to arc back towards the resting position thus turning the page.
9. A page turner as claimed in claim 8 wherein said wire is movable away from the open pages such that it does not interfere with the movement of said arm when said arm turns said single page.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2037312 CA2037312A1 (en) | 1991-02-28 | 1991-02-28 | Page turner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2037312 CA2037312A1 (en) | 1991-02-28 | 1991-02-28 | Page turner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2037312A1 true CA2037312A1 (en) | 1992-08-29 |
Family
ID=4147087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2037312 Abandoned CA2037312A1 (en) | 1991-02-28 | 1991-02-28 | Page turner |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2037312A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104442074A (en) * | 2013-09-13 | 2015-03-25 | 昆山市玉山镇仕龙设计工作室 | Infrared induction piano page turner |
-
1991
- 1991-02-28 CA CA 2037312 patent/CA2037312A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104442074A (en) * | 2013-09-13 | 2015-03-25 | 昆山市玉山镇仕龙设计工作室 | Infrared induction piano page turner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |