US PATENT SUBCLASS 165 / 156
.~ Helical conduit means

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

154  DF  NON-COMMUNICATING COAXIAL ENCLOSURES {2}
156.~ Helical conduit means

DEFINITION

Classification: 165/156

(under subclass 154) Apparatus with means forming a helical flow path in the outer chamber.