... on the use of international advanced technology for production: various series of rotary knives, dry knife, wetlands, knife, hex knife, ... , ridge knife, knife stubble, reclamation knife, knife tillers, disc harrow, disc plows piece, spring-tooth, etc., and to map non ... rotary tiller blade, tractor parts, s-tine, spring tine, tine harrow, mower blade,cutter plow, plow point,cultivator shovel plow