US PATENT SUBCLASS 180 / 9.54
.~.~.~.~ With spring

Current as of: June, 1999
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180 /   HD   MOTOR VEHICLES

7.1  DF  SPECIAL DRIVING DEVICE {6}
9  DF  .~ Portable track {2}
9.1  DF  .~.~ Endless, flexible {12}
9.5  DF  .~.~.~ Track support mounted for vertical movement {2}
9.54.~.~.~.~ With spring {2}
9.56  DF  .~.~.~.~.~> Longitudinally extending coil spring
9.58  DF  .~.~.~.~.~> Leaf or torsion spring {1}

DEFINITION

Classification: 180/9.54

(under subclass 9.5) Motor vehicles wherein spring means are provided between the track supporting structure and the vehicle frame.