US PATENT SUBCLASS 180 / 188
.~.~ Spiral type 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  DF  .~ With at least one surface-engaging propulsion element {6}
188.~.~ Spiral type element

DEFINITION

Classification: 180/188

Spiral type element:

(under subclass 186) Vehicle wherein at least one propulsion element comprises a reaction surface in the form of a screw or a helix which is driven about its axis of rotation, said axis being in general alignment with the direction of the vehicle's motion.