US PATENT SUBCLASS 248 / 620
.~.~.~ Tension and compression

Current as of: June, 1999
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248 /   HD   SUPPORTS

560  DF  RESILIENT SUPPORT {16}
618  DF  .~ Including spring zone understructure {9}
619  DF  .~.~ Diverse resilient elements {2}
620.~.~.~ Tension and compression

DEFINITION

Classification: 248/620

Tension and compression:

(under subclass 619) Structure wherein at least one of the resilient elements operates under tension and at least one other operates under compression.