US PATENT SUBCLASS 248 / 624
.~.~ Spiral 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}
624.~.~ Spiral spring {1}
625  DF  .~.~.~> Axially torsioned

DEFINITION

Classification: 248/624

Spiral spring:

(under subclass 618) Structure wherein the resilient means comprises a spiral coil.