Well pipe spacer

Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified

Patent

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Details

D23 40, 166241, D2301

Patent

active

D02583798

REFERENCES:
patent: D208388 (1967-08-01), Graham
patent: D240428 (1976-07-01), Hoffman
patent: 3292708 (1966-12-01), Mundt
patent: 3806168 (1974-04-01), McGee et al.
patent: 3933203 (1976-01-01), Evans
patent: 4042023 (1977-08-01), Fox
patent: 4088185 (1978-05-01), Carson
patent: 4099564 (1978-07-01), Hutchison

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