Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Chemical
Patent
1979-01-08
1980-09-30
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Chemical
D10 78, D1004
Patent
active
D02571315
REFERENCES:
patent: D211830 (1968-07-01), Hoyer
patent: D248457 (1978-07-01), Cullinane
patent: D250178 (1978-11-01), Maxwell
Design News, 5/12/65, p. 48, Electronic Hygrometer at top-right.
Ajeman Matthew L.
Holtje Nelson C.
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