| http://www.w3.org/ns/prov#value | - The outer cutting surfaces 16 of the fins 12 may be convex relative to the longitudinal axis of the elongated member 11 and these surfaces may be faced with a hard, abrasive material such as tungsten carbide, diamonds, and. the like; It is also contemplated that the hard, abrasive material may be extended to cover the bottom surface of the fins to provide a cutting surface or facing 16A which may
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