Triangle cut was adopted and directional window was excavated by cutting blasting and pneumaticpick 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。
2
The dynamic process of pneumaticpick and the conditions under which the normal starting and stable working are available are discussed by way of the theory of point transformation.
用点变换理论分析气镐的动力过程，讨论气镐正常起动和稳定工作的条件。
3
Coleman EzLift is a pneumatic lifting device used to pick up and balance varying loads.