Telephone calculator

Details Telephone calculator Telephone calculator

1975-08-11

1977-05-17

Stellar, George G.

179 90K, H04M 150

Patent

active

040243478

ABSTRACT:
The combination of a calculator and a telephone set and telephone tone generating means is arranged so that the calculator drives the telephone tone generators. When the telephone is activated, for example by lifting the handset, the calculator is connected to the tone generators with operation of the calculator switches driving the tone generators. A switch is provided whereby the calculator may subsequently be operated, as a calculator, while the telephone set is being used, without operating the tone generators.

REFERENCES:
patent: 3760121 (1973-09-01), Nissim
patent: 3932709 (1976-01-01), Hoff et al.

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