Housing for a one-way ultrasonic ceiling sensor

Details Housing for a one-way ultrasonic ceiling sensor Housing for a one-way ultrasonic ceiling sensor

1991-10-31

1993-07-27

Douglas, Alan P.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D10 46, D13158

Patent

active

D03377334

REFERENCES:
patent: D269072 (1983-05-01), Sweet et al.
patent: D290239 (1987-06-01), Bergerov
patent: D304019 (1989-10-01), Carsello
patent: D312611 (1990-12-01), Watson et al.
patent: 2396699 (1946-03-01), Hayes et al.

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