US PATENT SUBCLASS 72 / 370.18
.~.~.~.~ And external

Current as of: June, 1999
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72 /   HD   METAL DEFORMING

362  DF  PROCESS {8}
367.1  DF  .~ Tube making or reshaping {11}
370.16  DF  .~.~ Fin or thread forming {1}
370.17  DF  .~.~.~ Internal {1}
370.18.~.~.~.~ And external

DEFINITION

Classification: 72/370.18

And external:

(under subclass 370.17) Process in which additional ribs are made on the tube's* outer surface.