Engineering:Levelling stone
From HandWiki
A Levelling stone is an extremely hard, flat and abrasive stone used to flatten or level the surface of a whetstone which has become rounded, due to sharpening of blades.
References
A Levelling stone is an extremely hard, flat and abrasive stone used to flatten or level the surface of a whetstone which has become rounded, due to sharpening of blades.
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