US PATENT SUBCLASS 482 / 31
.~.~.~ Spring external to board

Current as of: June, 1999
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482 /   HD   EXERCISE DEVICES

23  DF  GYMNASTIC {8}
26  DF  .~ Projector {2}
30  DF  .~.~ Spring board {2}
31.~.~.~ Spring external to board

DEFINITION

Classification: 482/31

Spring external to board:

(under subclass 30) Subject matter wherein the thin planar member is provided with a separate resilient element to produce its thrust.