Hand held type electronic calculators

Details Hand held type electronic calculators Hand held type electronic calculators

1976-02-26

1982-01-19

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

174 50, 200 5A, 340719, 361400, G08B 536

Patent

active

043119964

ABSTRACT:
In a hand held type electronic calculator wherein a display section and a key board are mounted on the surface of an insulative substrate, a driving circuit for driving the display section and an operation circuit operated by the key board are also mounted on the same surface of the insulative substrate.

REFERENCES:
patent: 3193132 (1965-07-01), Gray
patent: 3751137 (1973-08-01), Fitzgibbons et al.
patent: 3858202 (1974-12-01), Boulanger
patent: 3950603 (1976-04-01), Brefka
patent: 4181964 (1980-01-01), Moore et al.

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