US PATENT SUBCLASS 72 / 370.19
.~.~ Corrugations forming

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}
370.19.~.~ Corrugations forming {1}
370.2  DF  .~.~.~> Axial

DEFINITION

Classification: 72/370.19

Corrugations forming:

(under subclass 367.1) Process in which the tube's* wall is bent making ridges and troughs.