1/2英寸内螺纹管道连接器
internal one-half inch thread conduit connection
垂直内螺纹管水冷壁
verti cal rifled waterwall temperature difference between adjacent tubes
vertical rifled waterwall
垂直内螺纹管
vertical internally ribbed tube
垂直并联内螺纹管
parallel vertical internally ribbed tube
Parallel vertical rifled tube
Parallel vertical rifled tubes
vertical parallel inner threaded tube
传力螺纹
power transmission screw thread
齿轮和螺纹加工机床
gear and thread cutting machine
车用螺纹磨具
thread grinding apparatus for lathe application