Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
D23 94, D231382, D23 95
patent: D253067 (1979-10-01), Hartley
patent: 4010729 (1977-03-01), Egli
patent: 4170217 (1979-10-01), Mayes
patent: 4271814 (1981-06-01), Lister
432698 Ontario Ltd.
Kemper Catherine E.
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