A portable summer. (Machine-translation by Google Translate, not legally binding)

摘要

A portable adder characterized essentially by being constituted by two semicajas joined by through rivets and equipped one of them with openings to expose the appropriate signs and the other of upper windows for the passage of as many actuator pushbuttons of an internal mechanism composed of multiple rotating wheels on cylindrical pivots. Outgoing from the semicaja itself. (Machine-translation by Google Translate, not legally binding)