US PATENT SUBCLASS 144 / 221
.~ Cylindrical cutter having spiral bit

Current as of: June, 1999
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144 /   HD   WOODWORKING

218  DF  ROTARY CUTTER {22}
221.~ Cylindrical cutter having spiral bit

DEFINITION

Classification: 144/221

Cylindrical cutter having spiral bit:

(under subclass 218) Rotary cutter formed by twisting a long blade spirally, with or without a core-piece.