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Patent:US3937939


Brevetto:US 3937939
Titolo:Single-hand digital calculator
Data:10.02.1976
Luogo:
Nazione:Stati Uniti
Persona:Frenkel, Marvin  (P)
Ditta:
Link interni:
Keywords:
Link al brevetto:
(without guarantee)
 US3937939 (espacenet),  US3937939 (uspto)


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Aus der Patentschrift US3937939

"An electronic digital calculator, the calculator being in the form of an elongated tubular body having a size and shape similar to a pen or pencil and having a plurality of input valve setting keys and function keys carried on its surface as well as illuminable "read-out", or display, screen. The value setting keys and the function keys are arranged on the surface of the tubular body such that the calculator can be used while held in one hand of the user." (Aus der Patentschrift)