Slide calculator

Details Slide calculator Slide calculator

1989-03-31

1991-05-14

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03168689

REFERENCES:
patent: D224259 (1972-07-01), Raimondi
patent: D254078 (1980-01-01), Van Exel
patent: 1866133 (1932-07-01), Simon
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patent: 2452417 (1948-10-01), Zentis
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patent: 3091389 (1963-05-01), Wiken
patent: 4028529 (1977-06-01), Van de Weghe
patent: 4189634 (1980-02-01), LaBove et al.
patent: 4308450 (1981-12-01), Ausman et al.
Perry Graf; Calculator & Visualizer Brochure.
Catalogue entitled, "Successful Promotions", by American Slide Chart Corporation, 1989.

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