Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1976-03-29
1977-08-23
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
D1004
Patent
active
D02454831
REFERENCES:
patent: 76521 (1868-04-01), Reid
patent: 439840 (1890-11-01), Granville
patent: 1052714 (1913-02-01), Durkee
patent: D232922 (1974-09-01), Niskin
Holtje Nelson C.
Militana Salvatore G.
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