Patent
1981-11-09
1983-07-19
Schreyer, Stafford D.
179 99LC, 179 94, 179 81C, H04M 172, H04M 900
Patent
active
043945449
ABSTRACT:
A line circuit which allows a multiple line telephone to operate like a private branch exchange (PBX) telephone. Solid state hold and flashing circuits drive a light emitting diode in each telephone connected to the same line.
REFERENCES:
patent: 4093830 (1978-06-01), Pappas
Black Robert J.
GTE Automatic Electric Labs Inc.
Hendricks Gregory G.
Schreyer Stafford D.
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