Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Weight – force or density
Patent
1990-08-21
1993-07-20
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Weight, force or density
D10 83, D10 89
Patent
active
D03375382
REFERENCES:
patent: 3251590 (1966-05-01), Kraeling
patent: 3290931 (1966-12-01), Fowkes et al.
patent: 4776414 (1988-10-01), Badcock
patent: 4802540 (1989-02-01), Grabovac et al.
Davis Antoine D.
Douglas Alan P.
Rose Howard L.
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