US PATENT SUBCLASS 72 / 434
.~.~.~ Coil spring

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

429  DF  WITH MEANS TO DRIVE TOOL {11}
431  DF  .~ Including yieldable connection in drive train to movable tool {2}
433  DF  .~.~ Including metallic spring connection {1}
434.~.~.~ Coil spring

DEFINITION

Classification: 72/434

Coil spring:

(under subclass 433) Apparatus wherein the elastic body is in the form of a helical coil*.