Slide rule

Details Slide rule Slide rule

1985-12-12

1988-12-06

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D02988364

REFERENCES:
patent: D241775 (1976-10-01), Dewey, Jr.
patent: 1922465 (1933-08-01), Woodward
patent: 3279695 (1966-10-01), Krause
patent: 3747845 (1973-07-01), Potuesi
patent: 4311902 (1982-01-01), Koll
patent: 4350878 (1982-09-01), Schwarz et al.
patent: 4456821 (1984-06-01), Harter

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