Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent
1991-11-22
1993-04-20
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Geometric
Patent
active
D03348920
REFERENCES:
patent: 418754 (1890-01-01), Schill
patent: 995574 (1911-06-01), Sarlls
patent: 4425714 (1984-01-01), Kelly, Jr.
patent: 4654975 (1987-04-01), Lopez
patent: 4937950 (1990-07-01), Farnworth
Davis Antoine D.
Douglas Alan P.
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