US PATENT SUBCLASS 180 / 9.46
.~.~.~.~ Pivoted track frame

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}
9.44  DF  .~.~.~ With track-related steering means {1}
9.46.~.~.~.~ Pivoted track frame

DEFINITION

Classification: 180/9.46

(under subclass 9.44) Motor vehicles wherein the track is carried by a frame which is pivotally mounted on the vehicle frame to turn about a vertical axis.