US PATENT SUBCLASS 172 / 711
.~.~ Leaf or torsion spring

Current as of: June, 1999
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172 /   HD   EARTH WORKING

681  DF  TOOL, STANDARD OR CONNECTION {32}
705  DF  .~ Spring biased or formed tool or tool part {5}
711.~.~ Leaf or torsion spring

DEFINITION

Classification: 172/711

(under subclass 705) Apparatus in which the resilient means comprises a single or superposed plate(s) or bar(s) adapted to yield through a bending action or a member which is stressed by an axial twist.