... has been engaged in the development of agricultural machinery and equipment for the blade to the national standard based on ... plowing, ridge knife, knife stubble, reclamation knife, knife tillers, disc harrow, disc plows piece, spring-tooth, etc., and to map non-standard ... ! Cultivator rotary tiller blade, tractor parts, s-tine, spring, disc harrow, mower blade, break shovel, cutter, plow point