Fan

Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Air treatment

Patent

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Patent

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D03254330

REFERENCES:
patent: D104119 (1937-04-01), Schwarz
patent: D135599 (1943-04-01), Spear
patent: D214017 (1969-05-01), Joly
patent: D221762 (1971-09-01), Boggs et al.
patent: D314617 (1991-02-01), Yuen
Industrial Equipment News, Jan. 1940, p. 11, Chromalox Electric Air Heater, Heating Equipment Box I.

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