Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1994-02-23
1995-12-05
Douglas, Alan P.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D 6477
Patent
active
D03649202
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The Home Craftsman, Jun. 1949, p. 13, Plant Husbandry Box.
Douglas Alan P.
Hanrath James P.
Matta Cathron B.
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