[国外标准] BS 1740-1-1971 Specification for wrought steel pipe fittings (screwed BS 21 R-series thread) part 1
[国外标准] BS 1336-1971 Specification for knotting
[国外标准] JIS B7539-1971 Cylindrical Squares
[国外标准] JIS X6192-1971 Dimensions for punched paper tape for information interchange
[农业行业标准] NY/T 1971-2010 水溶肥料 腐植酸含量的测定
[国家标准] GB 1971-2006 旋转电机 线端标志与旋转方向