| http://www.w3.org/ns/prov#value | - FIG. 3 is a plan view schematically illustrating the structure of a common grinder wheel.As illustrated in FIG. 3, in a grinder wheel 70, a grinder surface 74 is formed at the edge of the top surface of a disk-shaped grinder device 71.A hole 77 is formed in the center of the grinder wheel 70 in order to load the grinder device 71 in the spin of a motor.In general, the grinder wheel 70 including on
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