Whiworth standard screw thread的意思|示意

惠氏标准螺纹 ... Briggs standard pipe thread 布里格斯标准管螺纹 Whiworth standard screw thread 惠氏标准螺纹 standard screw thread gauge 标准螺纹量规 ; 标准螺纹规 ...

惠氏螺距 ... 半月销，半圆键，月牙键 Whiworth form of thread 惠氏螺距 Whiworth standard screw thread 惠氏标准螺纹 whole circle protractor ...