Expandable keyboard for electronic pocket calculators and the li

Details Expandable keyboard for electronic pocket calculators and the li Expandable keyboard for electronic pocket calculators and the li

1974-09-20

1976-02-24

Trafton, David L.

Communications: electrical

Systems

With specific power supply

200 5A, 235156, 340365R, G06F 302

Patent

active

039407586

ABSTRACT:
An expandable keyboard for a pocket-type calculator is made in modular form to electrically interconnect to form a keyboard much larger than that of a familiar pocket calculator. The keyboard portions are hinged together normally forming a stack, which occupies along with the display and the electronics, a space about as large as a conventional pocket calculator.

REFERENCES:
patent: 3226712 (1965-12-01), Lens et al.
patent: 3676656 (1972-07-01), Schmidt
patent: 3755806 (1973-08-01), Bunting
patent: 3808384 (1974-04-01), Bonlanger
patent: 3830352 (1974-08-01), Kolpex

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