US PATENT SUBCLASS 72 / 140
.~.~ By interchangeable or selectable tool portion

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

127  DF  BY DEFLECTING SUCCESSIVELY-PRESENTED PORTIONS OF WORK DURING BODILY MOVEMENT THEREOF (E.G., FOR COILING, LEVELLING, CURVING OR TROUGHING MATERIAL IN MOVEMENT) {11}
135  DF  .~ To form helical coil or tube {7}
140.~.~ By interchangeable or selectable tool portion

DEFINITION

Classification: 72/140

By interchangeable or selectable tool portion:

(under subclass 135) Subject matter including means on or within the instrumentality permitting (a) substitution of another diverting means therein, or (b) use of another work-engaging portion of the diverting means.