恒·变--连轧管工艺技术发展之路--纪念曼内斯曼兄弟发明斜轧穿孔工艺120周年
항·변--련알관공예기술발전지로--기념만내사만형제발명사알천공공예120주년
Permanency versus evolution--The route of the development of mandrel mill technology--commemorating the 120th anniversary of the invention of the rotary piercing process by Mannessmann brothers
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