US PATENT SUBCLASS 180 / 9.3
.~.~.~.~.~ Wheel or track contacts ground

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}
9.26  DF  .~.~.~ Convertible from wheel type {1}
9.28  DF  .~.~.~.~ Track remains with vehicle {1}
9.3.~.~.~.~.~ Wheel or track contacts ground

DEFINITION

Classification: 180/9.3

(under subclass 9.28) Motor vehicles wherein the arrangement of parts is such that when the flexible track contacts the ground the wheel means is out of ground contact.