Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1978-06-13
1980-09-16
Largen, James R.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D2301
Patent
active
D02569477
REFERENCES:
patent: D138325 (1944-07-01), Pool
patent: D253716 (1979-12-01), Spitz
patent: 285955 (1883-10-01), Barry
patent: 2764181 (1956-09-01), Rieholt
patent: 2887128 (1959-05-01), Bloomberg
patent: 3107546 (1963-10-01), Rowland
patent: 3788601 (1974-01-01), Schmitt
patent: 3970285 (1976-07-01), Lonn
patent: 3985335 (1976-10-01), Burke
patent: 4177835 (1979-12-01), Paley
California Screw Corporation
Freilich Arthur
Largen James R.
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