Printing and office machinery – Typewriter or calculator – Calculator
Patent
1979-08-06
1982-09-28
Spangler, Robert C.
Printing and office machinery
Typewriter or calculator
Calculator
D1801
Patent
active
D02663341
REFERENCES:
patent: D132908 (1942-06-01), Goehring
patent: D222893 (1972-01-01), Neumann et al.
patent: D238384 (1976-01-01), Mahood
patent: 2533580 (1950-12-01), Hall
patent: 3842707 (1974-10-01), Leonard
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