Telephone usage monitor

Details Telephone usage monitor Telephone usage monitor

1998-07-16

1999-11-30

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Lost child or person locator

1005

Patent

active

D04171632

REFERENCES:
patent: D313568 (1991-01-01), Castleberry et al.
patent: D345116 (1994-03-01), Cardinalli
patent: D349254 (1994-08-01), Buzzard
patent: D378753 (1997-04-01), DiBlasi et al.
patent: D383079 (1997-09-01), Baydown et al.

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