Printing and office machinery – Typewriter or calculator – Calculator
Patent
1980-01-09
1982-08-17
Spangler, Robert C.
Printing and office machinery
Typewriter or calculator
Calculator
D1801
Patent
active
D02658372
REFERENCES:
patent: D236353 (1975-08-01), Link
patent: D249093 (1978-08-01), Hazama et al.
patent: D251330 (1979-03-01), Kurosu et al.
Evans 1978 Catalog, p. 202-x, Item A, Calculator.
Best Products, 1976 Catalog, p. 350, Item B, Calculator.
Sharp Corporation
Spangler Robert C.
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