Combined calculator and clock

Printing and office machinery – Typewriter or calculator – Combined

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Details

D10 2, D10 15, 1801

Patent

active

D03820084

REFERENCES:
patent: D249822 (1978-10-01), Ohie et al.
patent: D304304 (1989-10-01), Charet et al.
patent: D310093 (1990-08-01), Sakaguchi et al.
patent: D317779 (1991-06-01), Chen
patent: D318019 (1991-07-01), Van Lelyveld
patent: D366215 (1996-01-01), George et al.

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