Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1981-01-13
1984-05-01
Largen, James R.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
Patent
active
D02736985
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patent: 3062236 (1962-11-01), Ludwig
patent: 3254675 (1966-06-01), Johnson
patent: 3559687 (1971-02-01), Aslan
patent: 4076045 (1978-02-01), Nakajima et al.
patent: 4215721 (1980-08-01), Hetherington
Largen James R.
Ross Operating Valve Company
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