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This and that of the grinding wheel

The bean knowledge of the whetstone. jpg
On earth what will grinding wheel be?
I am not known unexpectedly you do what kind of how to use, and what kind of thing you can do.
By the role that I cut the grinding wheel and sharpen it and polish, I am used for the field of metalwork mainly.
However, there are many kinds even if I say, and how to use is different from grinding wheel each, too.
The history of the grinding wheel was old and evolved with the times.
In modern society, the grinding wheel becomes indispensable.
Here, I introduce bean knowledge about such a grinding wheel.
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