Combined motion detector and audible alarm

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof

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Patent

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D03680428

REFERENCES:
patent: D297219 (1988-08-01), Taylor
patent: D308947 (1990-07-01), Downing
patent: D351175 (1994-10-01), Yeh
patent: 3255441 (1966-06-01), Goodwin et al.

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