Radiant heater

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

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D03296920

REFERENCES:
patent: D111000 (1938-08-01), Knox et al.
patent: D141834 (1945-07-01), Maxson, Jr.
patent: D267424 (1982-12-01), Boldt et al.
patent: D281811 (1985-12-01), Horst, Jr.
patent: D290391 (1987-06-01), Nakamura
patent: D325251 (1992-04-01), Schindler et al.
Advertisement published by Patton Electric Company, Inc., New Haven, Ind., titled "Patton . . . Wide Angle" published at least as early as Sep. 1991, on sale several months prior to Sep. 1991.

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