design of zirconia ceramic rods for sharpening knives
The rods 212a, 212b of the edge sharpener 200 of FIGS. 12-17 may be made of a ceramic material, for example, a nonporous zirconia or alumina ceramic, or an equivalent ceramic material. Optionally, the rods 212 a , 212 b may be made of any other material that would allow sharpening of an edge of a knife or cutting instrument having a cutting blade.
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