US PATENT SUBCLASS 267 / 177
.~.~ Adjustable

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

166  DF  COIL {6}
170  DF  .~ Including end thrust member {7}
177.~.~ Adjustable

DEFINITION

Classification: 267/177

(under subclass 170) Spring device including means for selectively varying the spring force of the spring element whereby the character of the thrust reaction may be correspondingly varied.