Printing and office machinery – Typewriter or calculator – Calculator
Patent
1980-02-27
1982-04-13
Spangler, Robert C.
Printing and office machinery
Typewriter or calculator
Calculator
D1801
Patent
active
D02638533
REFERENCES:
patent: D219589 (1970-12-01), Miller
patent: D220218 (1971-03-01), Jacobs et al.
patent: D248995 (1978-08-01), Hazama et al.
patent: D251271 (1979-03-01), Kobayashi
Sharp Corporation
Spangler Robert C.
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