Sonic signal generator

Details Sonic signal generator Sonic signal generator

1979-06-04

1981-10-06

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Element or attachment

D10106, D1005

Patent

active

D02611180

REFERENCES:
patent: D233319 (1974-10-01), Skarman
patent: D240121 (1976-06-01), Pasquarette
patent: D242133 (1976-11-01), Fitzsimmonds
patent: 4117462 (1978-09-01), Miller
Sears Roebuck Catalog, Spring & Summer, 1954, p. 811, Door Chime Cover N.

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