US PATENT SUBCLASS 297 / 293
.~ Coil spring comprises horizontal pivot

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297 /   HD   CHAIRS AND SEATS

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
293.~ Coil spring comprises horizontal pivot

DEFINITION

Classification: 297/293

(under subclass 285) Device wherein said elastic means comprises a helically-shaped element, which is disposed about a pivot about which the back moves, or is itself this pivot.