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CHRISTIAN MARBACH ERNEST
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CHRISTIAN MARBACH ERNEST
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Priority to ES0032693UpriorityCriticalpatent/ES32693U/en
Publication of ES32693UpublicationCriticalpatent/ES32693U/en
Game Rules And Presentations Of Slot Machines
(AREA)
Abstract
An abacus, characterized by the fact of presenting at least two networks of orthogonal lines distributed following logarithmic scales, and at least one network of oblique lines, distributed following a logarithmic scale, and forming with the lines of orthogonal networks angles of forty and five degrees, possessing these three networks scales that have the same origin and that allow to perform multiplications, divisions, squared elevations and extraction of square roots. (Machine-translation by Google Translate, not legally binding)
ES0032693U1952-04-291952-04-29An abacus (Machine-translation by Google Translate, not legally binding)
PendingES32693U
(en)
A teaching system to faclit anyone the knowledge of the technique of measurements of the time of the methods (Machine-translation by Google Translate, not legally binding)