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Patent

Hänvisningar finns i följande patent

citeras i Registreringsdatum Utfärdandedatum Ursprunglig innehavare Titel
US394075820 sep 197424 feb 1976Expandable keyboard for electronic pocket calculators and the like
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USRE329779 jul 19874 jul 1989Brother Kogyo Kabushiki KaishaKey-holding structure of keyboard with curved operating surface of keys