Rotary dial device for a telephone set

Details Rotary dial device for a telephone set Rotary dial device for a telephone set

1974-01-30

1976-08-03

Claffy, Kathleen H.

H04M 166

Patent

active

039730832

ABSTRACT:
A rotary dial device for a telephone set, in which an additional function of preventing a toll dialling is provided. In accordance with this invention, a contact is further attached to an usual dial to classify dial impulses so that when a number "1," one of numbers "2" to "9," and a number "0" are dialled, one, two and three pulses are produced respectively. The dialling function subsequent to the first dialling number "0" and the first and second dialling numbers "10" is effectively stopped by counting the classified pulses.

REFERENCES:
patent: 2767249 (1956-10-01), MacDonald
patent: 2914616 (1959-11-01), Lomax
patent: 3511939 (1970-05-01), Aikawa
patent: 3748402 (1973-07-01), Yussen
patent: 3757055 (1973-09-01), McCann et al.
patent: 3798381 (1974-03-01), Piacente et al.

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