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Priority to ES0010432UpriorityCriticalpatent/ES10432Y/en
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Publication of ES10432YpublicationCriticalpatent/ES10432Y/en
A table of multiplication and division, based on the Pythagorean table, which consists essentially of an appropriate board in which a table in the form of a square seen in perspective and divided by the lines of flight and guide in a hundred divisions numbered according to the Pythagorean table, the said escape and guide points being arranged on the same board, and on which are articulated sliding slides, which at their free ends embrace the edges of the board, which are curved with center at the said vanishing points and guide, also presenting the indicated board arcs with close and concentric divisions to the said edges. (Machine-translation by Google Translate, not legally binding)
ES0010432U1944-08-021944-08-02
Multiplication and division table.
ExpiredES10432Y
(en)
Notebook or similar to be used together with a book containing clarifications, etc., in relation to the latter. (Machine-translation by Google Translate, not legally binding)