Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1975-07-10
1977-03-08
Wertman, William N.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D0808
Patent
active
D02435829
REFERENCES:
patent: 1279651 (1918-09-01), Campbell
patent: 1569881 (1926-01-01), Reid
patent: 3138173 (1974-06-01), Hartman
Wertman William N.
Williams Michael
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