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It sounds very logical to me, that laboratories used much larger stones than barbers and such.
This is because of several things.

In laboratories for the past centuries straight razors or devices...

Abso-Effing-lutely once in a lifetime stone

That really is a nice coticule. I bet with heavy slurry, you can grind a wedge out of a 4mm hardened steel bar.

Because the idea of cutting it entered your mind I have to ask:
how much did you...