prov:value
| - The cutting edge of the blades may be optionally hardened by an appropriate coating, such as ME-92, tungsten carbide, or other suitable materials as taught by U.S. Pat. Nos. 4,771,774; 5,242,460; 5,312,425; 5,431,673; and 5,674,232, the contents of which are incorporated herein by reference.
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