US PATENT SUBCLASS 29 / 890.037
.~.~ Tube wound about tube

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.03  DF  .~ Heat exchanger or boiler making {15}
890.037.~.~ Tube wound about tube

DEFINITION

Classification: 29/890.037

Tube wound about tube:

(under subclass 890.03) Process wherein the heat exchanger or boiler made comprises a first elongated hollow generally cylindrical structure wrapped around a second elongated hollow generally cylindrical structure.