.~.~> With propulsion element of endless track type {1}
DEFINITION
Classification: 180/183
Member substitutable for wheel type support structure:
(under subclass 182) Vehicle in which at least one member is utilized to change at least part of the supportive engagement of the vehicle with the surface from a rolling contact type to a sliding contact type.
(1) Note. If the structure which provided the rolling contact type of engagement continues to perform--along with the member--a supporting function, there is not a substitution within the meaning of this subclass.
SEE OR SEARCH CLASS
280, Land Vehicles,
9+, for a vehicle provided with both supporting wheels and runners in which either the wheels or runners may be retracted into an inoperative position leaving the other in a position of support; and subclass 13 for runners which are designed to be applied to the wheels of a wheeled vehicle.
