Printing and office machinery – Typewriter or calculator – Calculator
Patent
1991-12-23
1994-02-01
Holtje, Nelson C.
Printing and office machinery
Typewriter or calculator
Calculator
D18 11
Patent
active
D03438546
REFERENCES:
B. A. Pargh, 1985, p. 188, casio calculator model HR8ECD, lower left corner of p.
Casio Computer Co. Ltd.
Holtje Nelson C.
Spear Robert M.
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