Combined audible signal and communicator

Details Combined audible signal and communicator Combined audible signal and communicator

1981-04-24

1984-05-15

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D14 66

Patent

active

D02738481

REFERENCES:
patent: D241323 (1976-09-01), Sparks
patent: 3517316 (1970-06-01), Anderson et al.
patent: 3978479 (1976-08-01), Schmitz
patent: 4142312 (1979-03-01), Stokes

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