Keyboard guide

Details Keyboard guide Keyboard guide

1986-02-18

1989-02-28

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Element or attachment

D19 59

Patent

active

D03000400

REFERENCES:
patent: 1560020 (1925-11-01), Curley
patent: 3501849 (1970-03-01), Olsen
patent: 4509873 (1985-04-01), Ryan

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