In-line telephone intercom system

Details In-line telephone intercom system In-line telephone intercom system

1985-02-04

1987-01-13

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

With intercom system

379163, H04M 172

Patent

active

046365893

ABSTRACT:
An in-line intercom system for use with telephones, in particular, a single line telephone. The intercom system includes an intercom unit, a hold unit and a ring silencing unit. The system is electro-mechanical and is modular so that it can be inserted directly into most existing telephone lines.

REFERENCES:
patent: 4088846 (1978-05-01), McEowen
patent: 4132860 (1979-01-01), Rasmussen
patent: 4485273 (1984-11-01), Bartelink
patent: 4490583 (1984-12-01), Bednarz et al.

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