Disk-sharpening devices, including cutting or filing tools adapted to be rotated about the disk or against which the disk is rotated. This subclass comprises, mainly, devices for sharpening harrow disks.
(1) Note. See this class, subclass 89.2 for devices for sharpening harrow disks, etc., by swaging by rolls or otherwise.
SEE OR SEARCH CLASS
172, Earth Working,
437, for earth working apparatus comprising the combination of an earth working disk and means to sharpen it.
451, Abrading, especially
321+, for a device for sharpening a disc by grinding.
