US PATENT SUBCLASS 297 / 339
.~.~.~ With force-multiplying means

Current as of: June, 1999
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297 /   HD   CHAIRS AND SEATS

311  DF  MOVABLE BOTTOM {5}
337  DF  .~ Movable independently of back {1}
338  DF  .~.~ Vertically {1}
339.~.~.~ With force-multiplying means

DEFINITION

Classification: 297/339

(under subclass 338) Device moved by means employing a mechanical advantage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

364, for a bottom-and-back unit movable vertically by force multiplying means.

SEE OR SEARCH CLASS

248, Supports,

404+, for a support surface adjustable vertically by a force multiplying means.