Combined transmitter and receiver alarm unit for locating childr

Details Combined transmitter and receiver alarm unit for locating childr Combined transmitter and receiver alarm unit for locating childr

1992-04-29

1994-01-18

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03433676

REFERENCES:
patent: D312222 (1990-11-01), Sawyer
patent: D329620 (1992-09-01), Salazar
patent: D333996 (1993-03-01), Matt et al.
patent: 2706806 (1955-04-01), Johnson
patent: 4291301 (1981-09-01), Chan

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