Electronic calculator having keyboard for entering data

Details Electronic calculator having keyboard for entering data Electronic calculator having keyboard for entering data

1976-03-31

1977-12-20

Smith, Jerry

Boots, shoes, and leggings

340365R, 364712, G06F 1502

Patent

active

040643999

ABSTRACT:
An electronic calculator comprises a semiconductor integrated circuit and an input keyboard which includes the series connection of a condition switch and an operation key, thereby minimizing the number of interconnections between the semiconductor integrated circuit and the keyboard.

REFERENCES:
patent: 3597600 (1971-08-01), Herendeen et al.
patent: 3715746 (1973-02-01), Hatano
patent: 3762637 (1973-10-01), Hernandez
patent: 3834616 (1974-09-01), Washizuka et al.
patent: 3892958 (1975-07-01), Tung

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