ES44690U - A board, with its complementary pieces, for the practice of arithmetic operations by the blind (Machine-translation by Google Translate, not legally binding) - Google Patents
A board, with its complementary pieces, for the practice of arithmetic operations by the blind (Machine-translation by Google Translate, not legally binding)Info
- Publication number
- ES44690U ES44690U ES0044690U ES44690U ES44690U ES 44690 U ES44690 U ES 44690U ES 0044690 U ES0044690 U ES 0044690U ES 44690 U ES44690 U ES 44690U ES 44690 U ES44690 U ES 44690U
- Authority
- ES
- Spain
- Prior art keywords
- blind
- translation
- practice
- board
- machine
- 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.)
- Granted
Links
Landscapes
- Structure Of Printed Boards (AREA)
Abstract
A board with its complementary pieces for the practice of arithmetic operations by the blind, essentially characterized by the fact that adopting the form that is deemed most convenient has a series of perforations on its surface that determine a number of round holes that are arranged in parallel and vertical lines being located symmetrically and equidistant holes from each other so that those horizontal and vertical lines correspond exactly so that all holes that determine a horizontal line are placed with each other at the same distance and these same holes in the horizontal line correspond in opposition to another vertical line in which they keep each other equal distance. (Machine-translation by Google Translate, not legally binding)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES0044690U ES44690Y (en) | 1954-10-28 | 1954-10-28 | A board, with its complementary pieces, for the practice of arithmetic operations by the blind |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES0044690U ES44690Y (en) | 1954-10-28 | 1954-10-28 | A board, with its complementary pieces, for the practice of arithmetic operations by the blind |
Publications (2)
Publication Number | Publication Date |
---|---|
ES44690U true ES44690U (en) | 1954-12-16 |
ES44690Y ES44690Y (en) | 1955-06-01 |
Family
ID=51107938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES0044690U Expired ES44690Y (en) | 1954-10-28 | 1954-10-28 | A board, with its complementary pieces, for the practice of arithmetic operations by the blind |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES44690Y (en) |
-
1954
- 1954-10-28 ES ES0044690U patent/ES44690Y/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES44690Y (en) | 1955-06-01 |
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