Telephone line status indicator

Details Telephone line status indicator Telephone line status indicator

1984-07-05

1987-02-03

Zarfas, Louis S.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Electrical property

Patent

active

D02880709

REFERENCES:
patent: D280389 (1985-09-01), Austin
patent: 4368363 (1983-01-01), Ahuja
B. A. Pargh Company Catalog .COPYRGT.1983, p. 46-Dual Modular Adaptor at upper left.

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