Calculating device for conversions or the like

Details Calculating device for conversions or the like Calculating device for conversions or the like

1979-11-29

1982-12-28

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1999

Patent

active

D02674122

REFERENCES:
patent: D143146 (1945-12-01), Hobbs
patent: D161088 (1950-12-01), Cacciarelli
patent: D241472 (1976-09-01), Deligt
patent: 2650763 (1953-09-01), MacGinnis

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