US PATENT SUBCLASS 172 / 288
.~.~ Plural interconnected relatively movable wheels

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}
288.~.~ Plural interconnected relatively movable wheels {1}
289  DF  .~.~.~> Transversely aligned stub shafts

DEFINITION

Classification: 172/288

(under subclass 286) Apparatus in which two or more wheels are interconnected whereby they are constrained to move relative to one another when angled.