Ultrasonic transmitting and receiving case for alarm systems

Details Ultrasonic transmitting and receiving case for alarm systems Ultrasonic transmitting and receiving case for alarm systems

1987-09-30

1990-10-02

Gandy, James M.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03109755

REFERENCES:
patent: D258353 (1981-02-01), Mango et al.
patent: D280390 (1985-09-01), Schweitzer

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