Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1977-06-20
1979-02-20
Largen, James R.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D 9175, D2301
Patent
active
D02511290
REFERENCES:
patent: D59407 (1921-10-01), Brown
patent: D169700 (1953-05-01), Rowe
patent: D193120 (1962-06-01), Gerber
patent: D229056 (1973-11-01), Grotz
patent: D241032 (1976-08-01), Burke et al.
patent: D241248 (1976-08-01), Burke et al.
patent: 1699459 (1929-01-01), Ullrich
patent: 4030664 (1977-06-01), Tisdo et al.
Kryshak Thad F.
Largen James R.
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