Printing and office machinery – Typewriter or calculator – Calculator
Patent
1979-10-11
1981-09-01
Spangler, Robert C.
Printing and office machinery
Typewriter or calculator
Calculator
D1801
Patent
active
D02605309
REFERENCES:
patent: D236353 (1975-08-01), Link
patent: D238951 (1976-02-01), Herr et al.
patent: D248994 (1978-08-01), Ikeda
patent: D255245 (1980-06-01), Yoshioka et al.
patent: 3984075 (1976-10-01), Bahner et al.
Home Furnishings Daily, Jun. 2, 1975, p. 19, Calculator at top center of page.
Evans 1977 Catalog, p. 169-yx, item P, Calculator.
Sharp Corporation
Spangler Robert C.
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