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Priority to ES0038332UpriorityCriticalpatent/ES38332Y/en
Publication of ES38332UpublicationCriticalpatent/ES38332U/en
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Publication of ES38332YpublicationCriticalpatent/ES38332Y/en
An elementary calculation rule, essentially characterized by the fact that having the appearances of a normal calculation rule, is in one piece, in any material, comprising on one side the data to perform addition and subtraction, and on the opposite side the corresponding to multiplications and divisions, in dependence with a single cursor that serves by its two fronts thanks to having on each front of this cursor, three windows, of which the central one is deviated from the line of the other two, this line being perpendicular to the edges of the cursor. (Machine-translation by Google Translate, not legally binding)