Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1991-10-11
1993-06-01
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
D23207
Patent
active
D03360512
REFERENCES:
patent: D225325 (1972-12-01), Marsh
patent: D229931 (1974-01-01), Winberg
patent: D253007 (1979-09-01), Casberg et al.
patent: D327858 (1992-07-01), Avitan
patent: D328330 (1992-07-01), Drager et al.
patent: D328330 (1992-07-01), Drager et al.
patent: D328331 (1992-07-01), Drager et al.
patent: 3326377 (1967-06-01), Abos
Drager Michael E.
Nelson John R.
Winberg Dennis G.
Zimmerman Jeffrey A.
Davis Antoine D.
Douglas Alan P.
Ecowater Systems, Inc.
Gealow Jon Carl
Wetzel James M.
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