US PATENT SUBCLASS 180 / 186
.~ With at least one surface-engaging propulsion element

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

182  DF  INCLUDING ONE OR MORE SKI-LIKE OR RUNNER MEMBERS {2}
186.~ With at least one surface-engaging propulsion element {6}
187  DF  .~.~> Element shuffles along support surface
188  DF  .~.~> Spiral type element
189  DF  .~.~> Plural elements connected to and spaced along the plural throws of a common crankshaft
190  DF  .~.~> Endless track type element {3}
194  DF  .~.~> Plural discrete elements protruding from a wheel, hub, or shaft {1}
196  DF  .~.~> Element comprises traction wheel

DEFINITION

Classification: 180/186

With at least one surface-engaging propulsion element:

(under subclass 182) Vehicle provided with one or more supporting-surface-contacting propulsion elements.