Would serrated cutting edges on a wood chipper knife allow the chipper to cut harder woods easier by having more of a tooth to bite with than a long full contact edge?
Troy-Bilt PTO HORSE Tiller with Chipper/Shredder and Log Splitter for Sale in Gurnee, IL - OfferUp
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Troy Bilt Chipper / Shredder 10 hp. (Price Reduced) - general for sale - by owner - craigslist