Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Weight – force or density
Patent
1993-02-24
1994-06-14
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Weight, force or density
Patent
active
D03477991
REFERENCES:
patent: D221476 (1971-08-01), Martin
patent: 2821592 (1958-01-01), Sagar
patent: 3557616 (1971-01-01), Landon, Jr. et al.
patent: 5226447 (1993-07-01), Burley
Anderson James G.
Dunham Glen M.
Baroid Technology Inc.
Davis Antoine D.
Douglas Alan P.
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