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Individual
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Priority to ES0059697UpriorityCriticalpatent/ES59697Y/en
Publication of ES59697UpublicationCriticalpatent/ES59697U/en
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Publication of ES59697YpublicationCriticalpatent/ES59697Y/en
A calculating rule, circular, for controlled fecundity, characterized by being constituted by a base disk whose periphery is equipped with boxes corresponding to the days of the month counted up to thirty-one, being found especially marked the last three to adapt the system to any month , comprising on this base plate another circle, rotatable in its center and provided at a point on the edge of a lever appendage that mounts on the periphery of the base circle and allows through a window made in said appendix one of the numbers that are on the edge of the base circle. (Machine-translation by Google Translate, not legally binding)
ES0059697U1957-04-131957-04-13
Calculating ruler, circular for controlled fertility
ExpiredES59697Y
(en)
Simplified device of numerator dater, based on printing plate and insert year indicator adaptable to said plate (Machine-translation by Google Translate, not legally binding)