US PATENT SUBCLASS 160 / 316
.~.~.~ Nested helical springs

Current as of: June, 1999
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160 /   HD   FLEXIBLE OR PORTABLE CLOSURE, PARTITION, OR PANEL

238  DF  ROLL TYPE {12}
309  DF  .~ With rotating means {5}
313  DF  .~.~ Spring {5}
316.~.~.~ Nested helical springs

DEFINITION

Classification: 160/316

(under subclass 313) Roll type devices in which there are a plurality of helical springs one nested within another or in which the succeeding sections of a spring are each wound back over the previous inner section.

SEE OR SEARCH THIS CLASS, SUBCLASS:

317, for other plural springs.