Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1982-04-22
1985-01-01
Spangler, Robert C.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D 9448
Patent
active
D02770237
REFERENCES:
patent: D128490 (1941-07-01), Hayes
patent: D207636 (1967-05-01), Clevenger et al.
patent: D213179 (1969-01-01), Clevenger
patent: 3474938 (1969-10-01), Clevenger
English Glass Company Limited
Spangler Robert C.
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