Combined transmitter and receiver for indicating mail arrival

Details Combined transmitter and receiver for indicating mail arrival Combined transmitter and receiver for indicating mail arrival

1992-01-16

1993-08-24

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Lost child or person locator

D99 30

Patent

active

D03386325

REFERENCES:
patent: 3222665 (1965-12-01), Tracy
patent: 3611333 (1971-10-01), Conigliaro
patent: 4596357 (1986-06-01), File
patent: 4815656 (1989-03-01), Smith
patent: 4848650 (1989-07-01), Roberts, II
patent: 4905891 (1990-03-01), Wildash
patent: 4999612 (1991-03-01), Cherveny
patent: 5023595 (1991-06-01), Bennett

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