US PATENT SUBCLASS 267 / 168
.~ Plural, one within another

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

166  DF  COIL {6}
168.~ Plural, one within another

DEFINITION

Classification: 267/168

(under subclass 166) Spring device including a pair of said elements, one of which surrounds the other directly (i.e., with no structural element intervening therebetween).