Apparatus for exchanging heat with subterranean regions
United States Patent 2554661

Inventors:
Clancy, Gilbert E.
Publication Date:
05/29/1951
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Assignee:
DRAYER HANSON INC
Primary Class:
165/45
Other Classes:
62/260, 165/181, 165/142, 165/185
International Classes:
F28F1/12
US Patent References:
2374317Well production equipment
2428876Air-conditioning system for cooling or heating
Foreign References:
CH59350A