US PATENT SUBCLASS 180 / 9.28
.~.~.~.~ Track remains with vehicle

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.~.~.~.~ Track remains with vehicle {1}
9.3  DF  .~.~.~.~.~> Wheel or track contacts ground

DEFINITION

Classification: 180/9.28

(under subclass 9.26) Motor vehicles wherein the flexible track is always carried by a vehicle provided with ground wheel means and by an adjustment of parts may be brought into or out of ground contact.