Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1975-04-03
1977-01-25
Burke, Wallace R.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D2303, D0708
Patent
active
D02431840
REFERENCES:
patent: 1030002 (1912-06-01), Livingston
patent: 1640771 (1927-08-01), Hannum
patent: 3901212 (1975-08-01), Stites
patent: D228728 (1973-10-01), Bergstrom
Bullock B. J.
Burke Wallace R.
Learman John F.
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