Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1975-09-17
1977-06-07
Douglas, Alan P.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D2303
Patent
active
D02446081
REFERENCES:
patent: 1889238 (1932-11-01), Clark
Douglas Alan P.
Drucker William Anthony
S. W. Hart & Co. Pty. Ltd.
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