Combined electronic warning receiver and calculator

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Lost child or person locator

Patent

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D18 7

Patent

active

D03741885

REFERENCES:
patent: D331888 (1992-12-01), Zade
patent: D332961 (1993-02-01), Peersmann
patent: D333636 (1993-03-01), Issa
patent: D351173 (1994-10-01), Yeh
patent: D354922 (1995-01-01), Gartner

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