US PATENT SUBCLASS 72 / 370.21
.~.~ Groove 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}
370.21.~.~ Groove forming

DEFINITION

Classification: 72/370.21

Groove forming:

(under subclass 367.1) Process in which a channel is made on a surface of the tube*.