City skylines small oil drilling rig

Of the four industry specializations in Cities: Skylines Industries (farming, forestry, ore, and oil), oil is unlocked last. You’ll need to have reached the Busy Town milestone to unlock it. To do that, you’ll wa. [pdf]

Development of twin-screw air compressors in Argentina

Due to the growing need for the compressed air of higher quality, the water-lubricated twin-screw compressor with water as the only liquid in the compressor has drawn much attention to produce clean air a. [pdf]