Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1983-05-02
1986-03-11
Spangler, Robert C.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D 9374
Patent
active
D02829576
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patent: 453530 (1891-06-01), Baker et al.
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patent: 3648933 (1972-03-01), Grotz
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