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DURIBEL S A
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Priority to ES0015399UpriorityCriticalpatent/ES15399Y/en
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Publication of ES15399YpublicationCriticalpatent/ES15399Y/en
"A NEW MACHINE OF SUMAS" characterized by the fact that it is composed of a frame -2-, of aero-dynamic lines, in the form of a desk, of reduced dimensions, which contains the mechanism and which presents, in its front part, a window -4-, through which appear, as you press the numbered keys -5- the figures that must constitute the result of the sum. (Machine-translation by Google Translate, not legally binding)