Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1993-05-17
1994-09-13
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
D10 70
Patent
active
D03504891
REFERENCES:
patent: D246441 (1977-11-01), Bergendorff
patent: D293087 (1987-12-01), Grinde
patent: 3874237 (1975-04-01), Zwarts
How Things Work, vol. 4, Roger Jean Segalat, pp. 237, 239, Before 1985.
Davis Antoine D.
Douglas Alan P.
Keegan Robert R.
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