Өмнөд Африк дахь бутлуурын өртөг тооцох арга
Энэтхэг дэх бутлуурын үйлдвэр 200 Tph. 2000 - Tumi Raise Boring. The 2000 is the most powerful machine of the family, capable of drilling very long holes and boring raises of 26 ft (8 m) or larger in certain rock conditions and up to 8,200 ft (2,500 m) in length.
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