US PATENT SUBCLASS 180 / 9.21
.~.~.~ Track substituted for drive wheel

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}
9.21.~.~.~ Track substituted for drive wheel

DEFINITION

Classification: 180/9.21

Track substituted for drive wheel:

(under subclass 9.1) Motor vehicles wherein the endless track is substituted for one or more of the regular drive wheels of the vehicle.