Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property
Patent
1993-04-12
1994-09-20
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Electrical property
Patent
active
D03507017
REFERENCES:
patent: D252502 (1979-07-01), Kelly, III
patent: 4514695 (1985-04-01), Lau
patent: 4839597 (1989-06-01), Rowland
Chandler Charles W.
Davis Antoine D.
Douglas Alan P.
Guardforce Corporation
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