Verification regulation of casing coupling meter 套管尺檢定規(guī)程
Casing coupling conneting with electric wire 電線連接套管
Vertical motion of the carriage is provided by a pulldown gear case coupled by two pinions to racks on the mast 滑架的垂直移動(dòng)是由一個(gè)下拉齒輪箱提供的,該下拉齒輪箱則通過(guò)兩個(gè)小齒輪連接到支架上的齒條上。