Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1981-01-21
1983-06-21
Largen, James R.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D2304
Patent
active
D02694565
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Hardware Age, Apr. 1974, p. 121, "Roof Ventilator Model" item.
Bahr Donald R.
Largen James R.
Questor Corporation
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