US PATENT SUBCLASS 172 / 290
.~.~ Swinging axle

Current as of: June, 1999
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172 /   HD   EARTH WORKING

278  DF  WITH WHEEL STEERING OR ACTUATOR FOR HORIZONTALLY ANGLING WHEEL AXIS {3}
286  DF  .~ Wheel on non-propelled device {4}
290.~.~ Swinging axle

DEFINITION

Classification: 172/290

(under subclass 286) Apparatus wherein two wheels are supported by one axle mounted for pivotal swinging movement about a vertical axis.