Printing and office machinery – Typewriter or calculator – Calculator
Patent
1988-06-22
1990-12-25
Holtje, Nelson C.
Printing and office machinery
Typewriter or calculator
Calculator
Patent
active
D03132447
REFERENCES:
patent: D248369 (1978-07-01), Robertson et al.
patent: D306456 (1990-03-01), Chan
patent: 2008153 (1935-07-01), Payne et al.
patent: 2073352 (1937-03-01), Scharlau
patent: 3190257 (1965-06-01), Blythe, Jr.
patent: 3718519 (1973-02-01), Montgomery
patent: 4149068 (1979-04-01), Simon
Holtje Nelson C.
Veynar Caron D.
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