US PATENT SUBCLASS 180 / 9
.~ Portable track

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

7.1  DF  SPECIAL DRIVING DEVICE {6}
9.~ Portable track {2}
9.1  DF  .~.~> Endless, flexible {12}
10  DF  .~.~> Annular

DEFINITION

Classification: 180/9

(under subclass 7.1) Motor-vehicles adapted to travel upon a track carried by the vehicle.

SEE OR SEARCH CLASS

305, Wheel Substitutes for Land Vehicles,

6+, for rigid portable tracks.