Calculator

Details Calculator Calculator

1979-10-29

1982-06-29

Spangler, Robert C.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02652080

REFERENCES:
patent: D223832 (1972-06-01), Penny et al.
patent: D227471 (1973-06-01), Yamamota et al.
patent: D228190 (1973-08-01), Link
patent: D228290 (1973-09-01), Hazama
patent: D250430 (1978-11-01), Nishiquchi

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