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0012 preferably the sphere polishing grindstone is formed of a metal bond a resin bond and or an abrasive selected from at least one of diamond abrasive cbn abrasive alumina-based abrasive and silicon carbide-based abrasive. and a grindstone structure bonded by any of the bididized bonds. in this way a spherical polishing wheel excellent in polishing performance or durability can be.
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