(under subclass 518) Apparatus comprising a circumferential earth working element adapted to be readily attached to and detached from a generally circular platelike member commonly called a "disk" so as to surround the circumference of the platelike member.
SEE OR SEARCH THIS CLASS, SUBCLASS:
243, for a detachable rim for a disk, the rim being used as a
ground wheel.
SEE OR SEARCH CLASS
301, Land Vehicles: Wheels and Axles,
63.1+, for vehicle wheels in which the supporting portion between the ground-engaging rim and the hub is in the form of a continuous or deformed disk.
