used okamoto automatic surface grinder ACC16-32 ST used okamoto automatic surface grinder ACC16-32 ST used okamoto automatic surface grinder ACC16-32 ST used okamoto automatic surface grinder ACC16-32 ST used okamoto automatic surface grinder ACC16-32 ST used okamoto automatic surface grinder ACC16-32 ST used okamoto automatic surface grinder ACC16-32 ST used okamoto automatic surface grinder ACC16-32 ST