Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
patent: D155243 (1949-09-01), Sundberg
patent: D199008 (1964-08-01), Marshall
patent: D203785 (1966-02-01), Meisner
patent: D227571 (1973-07-01), Cook
patent: 3702918 (1972-11-01), Moller
patent: 3846617 (1974-11-01), Glucksman
Washington Post, Oct. 24, 1973, p. A-14, Flowtron Heater/Cooler.
Firma Elektro-Warme Technik
Largen James R.
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