Conversion calculator or similar article

Details Conversion calculator or similar article Conversion calculator or similar article

1980-04-14

1982-03-30

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1999

Patent

active

D02636034

REFERENCES:
patent: D20005 (1890-07-01), Tewksbury
patent: 3432927 (1969-03-01), Springer
patent: 3747846 (1973-07-01), Long

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