Black jack slide rule

Details Black jack slide rule Black jack slide rule

1979-10-15

1981-10-20

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D10 461, D1999

Patent

active

D02613999

REFERENCES:
patent: 2237873 (1941-04-01), Barok
patent: 3231189 (1966-01-01), Barham
patent: 3280788 (1966-10-01), Robinson, Jr.
patent: 3718519 (1973-02-01), Montgomery

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