Automatic telephone dialer utilizing an electronic telephone boo

Telephonic communications – Supervisory or control line signaling – Substation originated

Patent

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Details

379355, H04M 123

Patent

active

046619763

ABSTRACT:
An automatic telephone dialer device comprising, in combination:

REFERENCES:
patent: 3988550 (1976-10-01), Ts'ao
patent: 4029908 (1977-06-01), Moseley et al.
patent: 4431870 (1984-02-01), May et al.

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