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。
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