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
Application number
ES0044690U
Other languages
Spanish (es)
Other versions
ES44690Y (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CASANE FERNANDEZ JULIO
Original Assignee
CASANE FERNANDEZ JULIO
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CASANE FERNANDEZ JULIO filed Critical CASANE FERNANDEZ JULIO
Priority to ES0044690U priority Critical patent/ES44690Y/en
Publication of ES44690U publication Critical patent/ES44690U/en
Application granted granted Critical
Publication of ES44690Y publication Critical patent/ES44690Y/en
Expired legal-status Critical Current

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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)
ES0044690U 1954-10-28 1954-10-28 A board, with its complementary pieces, for the practice of arithmetic operations by the blind Expired ES44690Y (en)

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)

Also Published As

Publication number Publication date
ES44690Y (en) 1955-06-01

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