Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1979-01-22
1981-09-15
Largen, James R.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D15 5, D2301
Patent
active
D02608103
REFERENCES:
patent: D56925 (1921-01-01), Humphrey
patent: D249276 (1978-09-01), Levin
patent: 680125 (1901-08-01), Coldron
patent: 1556417 (1925-10-01), Carroll
patent: 2644474 (1953-07-01), Houchin
patent: 2835234 (1958-05-01), Rusch et al.
patent: 3416818 (1968-12-01), Conlin
Popular Science, Nov. 1968, pp. 116 & 117, "Prestone Flushing Tee" item.
Largen James R.
Palmatier H. Dale
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