第三类自磨刃（ＤＳＺ）犁铧的研制王翠兰李凌云保定农机厂１前言我们研制成功已获国家专利并列入国家级新产品的ＤＺ型旱田系列犁铧，从１９８９年开始平均以每年十几万件的产量投放市场以来，已逐渐被全国广大用户所认识和选购，和仿苏传统凿形尖犁铧（以下简称传统犁铧... Development of the third type of self-sharpening plowshare Wang Cuilan Li Lingyun Baoding Nongchang 1 Introduction We successfully developed the DZ-type dryland series ploughshare that has obtained the national patent and is included in the state-level new products. From 1989 on average, Pieces of production on the market, has gradually been recognized and the vast number of users across the country, and imitation of the traditional Soviet-style chisel plowshares (hereinafter referred to as the traditional plowshare ...