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经一机部批准,有关凿岩机械与风动工具行业的九项部标从一九七六年一月一日起正式实施,这些标准是: JB1540—75 冲击式风扳机型式与基本参数 JB1541—75 冲击式风扳机技术条件
Approved by the Ministry of Machine Building, the nine ministerial standards relating to the rock drilling machinery and wind power tool industry have been put into force since January 1, 1976. The standards are: JB1540-75 Impact Type and Basic Parameters JB1541- Impact type pneumatic trigger technical conditions