US PATENT SUBCLASS 180 / 9.48
.~.~.~ Laterally extendable track

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}
9.48.~.~.~ Laterally extendable track

DEFINITION

Classification: 180/9.48

(under subclass 9.1) Motor vehicles wherein the flexible track is carried by a frame and (1) there are means to selectively hold the track frame at various distances from the vehicle frame, or (2) the track frame is adapted to accommodate tracks of varying widths.