Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1978-07-24
1981-12-08
Kemper, Catherine E.
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
D2303
Patent
active
D02622343
REFERENCES:
patent: 3394697 (1968-07-01), Lewis
patent: 4019677 (1977-04-01), Dotschkal et al.
patent: 4159801 (1979-07-01), Roland
patent: 4191163 (1980-03-01), Ballard
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