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Q8038
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What denotes by (A) in the (A60K5V8) mentioned marking system of a grinding wheel?
Q8039
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What denotes by '46' in the (A46K5V8) mentioned marking system of a grinding wheel
Q8040
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What denotes by ?5? in the (A60H5V8) mentioned marking system of grinding wheel?
Q8041
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What denotes by 8 in the (A46H5V8) mentioned marking system of a grinding wheel?
Q8042
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Which natural abrasive used to make grind stones?