Portable signalling device for monitoring telephone rings

Details Portable signalling device for monitoring telephone rings Portable signalling device for monitoring telephone rings

1989-02-06

1991-01-08

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03135683

REFERENCES:
patent: D174792 (1955-05-01), Frank
patent: D285542 (1986-09-01), Tanaka et al.
patent: D309119 (1990-07-01), Kremityki
patent: 2553244 (1951-05-01), Ellmann
patent: 3182307 (1965-05-01), Doggart

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