Jiebao air compressor screw type

They are powered by two counter-rotating screws that compress air as it moves through the compressor. These units are designed for continuous use, capable of operating 24 hours a day, 7 days a week. [pdf]

Indonesia 100 type down-the-hole drilling rig

In the application of drilling machinery, the air-leg rock drillcan only drill small-aperture, medium-shallow blast holes; the heavy-duty rail-type rock drill can also drill deep blast holes through the post, but the en. [pdf]