When information regarding the rock at any given site is desired rock coring can be conducted in order to evaluate the type, quality, soundness, strength and other properties of the rock. Rock coring is gen.
[pdf] Core drill rigs, also known as core drilling rigs, are specialized machines used to extract cylindrical samples (cores) from various materials such as rock, soil, concrete, and asphalt.
[pdf] As a kind of friction clutch that uses compressed air as manipulating power source, pneumatic-tyred clutch is widely used in such equipment as oil drilling rig and workover rig, and is also an important part of the drive systems of oil drilling rig and workover rig.
[pdf] 
