two-groove drill
... two-groove belt pulley 双槽皮带轮 two-groove drill 双槽钻 two-gun oscilloscope 双枪示波器 ...
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左旋双槽钻头 left-hand two-flute drill
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4英寸)钻铤NC35螺纹加工LE螺纹、应力槽、双台肩后进行了实物抗扭性能试验,证实双台肩钻铤具有很好的抗扭性能。
After processing LET thread, stress groove and double shoulder connection for the NC35 thread of Drill Collar in 43/4 inch, torsion tests were done.
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