Health aid calculator

Details Health aid calculator Health aid calculator

1988-12-23

1991-03-05

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03151689

REFERENCES:
patent: D43451 (1913-01-01), Sauze
patent: D135349 (1943-03-01), Sterling
patent: D241775 (1976-10-01), Deney, Jr.
patent: 853411 (1907-05-01), Hunt
patent: 2234896 (1941-03-01), De Turk
patent: 2462338 (1949-02-01), Sieradzki
patent: 3279695 (1966-10-01), Krause
patent: 3511438 (1970-05-01), Melendez

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