Device for selectively interrupting mechanical operation of a ma

Details Device for selectively interrupting mechanical operation of a ma Device for selectively interrupting mechanical operation of a ma

1976-08-30

1978-05-30

Claffy, Kathleen H.

H04M 166

Patent

active

040925005

ABSTRACT:
An attachment for telephones using direct dialing mechanism, or the push button type, which may be selectively moved to one position to prevent the user from completing a direct dial long distance call, and into another position that will prevent such calls by interrupting the service when the user attempts to dial the Operator.

REFERENCES:
patent: 3513271 (1970-05-01), Stathacopoulos
patent: 3757055 (1973-09-01), McCann et al.
patent: 3899640 (1975-08-01), Piacente et al.
patent: 3937900 (1976-02-01), Nagakura
patent: 4000380 (1976-12-01), Jackson

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