Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1979-09-21
1981-11-17
Kemper, Catherine E.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D2303
Patent
active
D02619245
REFERENCES:
patent: 2415471 (1947-02-01), Dorfan
patent: 3623470 (1971-11-01), Wilholte
patent: 3654913 (1972-04-01), Derringer
patent: 4020823 (1977-05-01), Baumbach
Home Energy Digest Woodburning Quarterly, Summer 1978, p. 85, Johnson Energy Converter.
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