US PATENT SUBCLASS 144 / 24.11
.~.~ And expanding

Current as of: June, 1999
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144 /   HD   WOODWORKING

2.1  DF  SPECIAL-WORK MACHINE {34}
24.1  DF  .~ Log punching {1}
24.11.~.~ And expanding

DEFINITION

Classification: 144/24.11

And expanding:

(under subclass 24.1) Machine intended to also force the grain of the wood apart in the area pierced.