US PATENT SUBCLASS 267 / 155
.~ Coil

Current as of: June, 1999
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267 /   HD   SPRING DEVICES

154  DF  TORSION {1}
155.~ Coil {2}
156  DF  .~.~> Volute
157  DF  .~.~> Also compressible or expansible

DEFINITION

Classification: 267/155

(under subclass 154) Spring device in which the spring element is in the form of a spirally wound body.