Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1977-02-22
1978-09-12
Largen, James R.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D2301
Patent
active
D02493551
REFERENCES:
patent: D211724 (1968-07-01), Schneider, Jr.
patent: D213440 (1969-03-01), Wildgen
patent: 3407412 (1968-10-01), Spear
patent: 3444566 (1968-05-01), Spear
patent: 3890657 (1975-06-01), Gray
patent: 4064572 (1977-12-01), Wicks et al.
Clendenen Ronald L.
Largen James R.
Shell Oil Company
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