The development and application of this device provided a necessary mean for the slim hole track measurement and directional window cutting.
它的开发、应用成功，为小井眼、短半径井的井眼轨迹测量、斜向器定向开窗作业提供了必备的测量手段。
Triangle cut was adopted and directional window was excavated by cutting blasting and pneumatic pick repair.
方案设计采用三角形爆破缺口，掏槽爆破加风镐修整开凿定向窗。
Triangle cut was adopted and directional window was excavated by cutting blasting and pneumatic pick repair.
方案设计采用三角形爆破缺口，掏槽爆破加风镐修整开凿定向窗。
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