US PATENT SUBCLASS 248 / 623
.~.~.~ Helical spring

Current as of: June, 1999
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248 /   HD   SUPPORTS

560  DF  RESILIENT SUPPORT {16}
618  DF  .~ Including spring zone understructure {9}
622  DF  .~.~ Resilient vertical standard {1}
623.~.~.~ Helical spring

DEFINITION

Classification: 248/623

Helical spring:

(under subclass 622) Structure wherein the resilient member comprises an elongated spiral coil.