| http://www.w3.org/ns/prov#value | - 20150034608GRINDING SYSTEM AND SPOT WELDING SYSTEM - A grinding system includes a period determiner that determines, on the basis of a torque of a grinder of a dresser that grinds a welding tip, whether the current period is a grinding period in which the grinder is grinding the welding tip or a non-grinding period in which the grinder is not grinding the welding tip; and an anomaly detector that
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