Portable motion detector

Details Portable motion detector Portable motion detector

1993-08-16

1994-10-25

Douglas, Alan P.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03518060

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patent: 4954813 (1990-09-01), August, Sr. et al.
patent: 4996521 (1991-02-01), Hollow

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