US PATENT SUBCLASS 180 / 6.54
.~ Variable contact
Current as of: June, 1999
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DEFINITION
Classification: 180/6.54
(under subclass 6.2) Vehicles in which the effective tractive area of a traction element or elements is varied.
(1) Note. These vehicles, for the most part, have endless flexible traction elements.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6.7, for vehicles having endless flexible traction elements, steered by driving, but not involving variable ground contact.
15, for vehicles having auxiliary traction elements.
16, for auxiliary traction elements adapted to be attached to vehicles.