Combined transmitter and receiver for traffic control of emergen

Details Combined transmitter and receiver for traffic control of emergen Combined transmitter and receiver for traffic control of emergen

1990-02-28

1993-07-06

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Lost child or person locator

D10109

Patent

active

D03370666

REFERENCES:
patent: D315696 (1991-03-01), Kearns
patent: 2001440 (1935-05-01), West
patent: 3257641 (1966-06-01), Campana et al.
patent: 3550078 (1970-12-01), Long
patent: 3881169 (1975-04-01), Malach
patent: 4017825 (1977-04-01), Pickey
patent: 4573049 (1986-02-01), Obeck
patent: 4704610 (1987-11-01), Smith
patent: 4736186 (1988-04-01), Jones
patent: 4775865 (1988-09-01), Smith
patent: 4914434 (1990-04-01), Morgan et al.
patent: 5014052 (1991-05-01), Obeck

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