Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1979-01-26
1981-02-24
Holtje, Nelson C.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D10 94, D10 85, D23 40, D2301
Patent
active
D02583810
REFERENCES:
patent: D235139 (1975-05-01), Ekman
patent: D237968 (1975-12-01), Olson
patent: D251011 (1979-02-01), Krechel
patent: 1490584 (1924-04-01), Bornheldt
patent: 1569178 (1926-01-01), Foster
patent: 3760842 (1973-09-01), Mikiya
Fuel Oil and Oil Heat, 10/61, p. 25H61, Couplings at bottom.
Holtje Nelson C.
Hubbard Mickey
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