US PATENT SUBCLASS 29 / 890.053
.~.~ Tube making or reforming


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}
890.053.~.~ Tube making or reforming


DEFINITION

Classification: 29/890.053

Tube making or reforming:

(under subclass 890.03) Process wherein (1) the article made comprises an elongated hollow generally cylindrical member or (2) such an existing cylindrical member is reshaped.