Printing and office machinery – Typewriter or calculator – Calculator
Patent
1980-07-15
1986-06-24
Feifer, Melvin B.
Printing and office machinery
Typewriter or calculator
Calculator
D14 70
Patent
active
D02843889
REFERENCES:
patent: D228350 (1973-09-01), Yoshida et al.
patent: D228784 (1973-10-01), Kitai
patent: D239732 (1976-04-01), Vong
Dag Bille Svensk Ideutveckling AB
Feifer Melvin B.
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