What is the implementation standard of geological drill pipe?

Release time:

2019-11-19

Author:

Source:

the People's Republic of China Ministry of Coal Industry Standard MT/T521-2006.

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Key words:

Sore! An accident occurred in a coal mine under Shandong's largest state-owned enterprise, trapping 11 people!

Regular type of geological drill pipe of beneficial mine science and technology?

Sore! An accident occurred in a coal mine under Shandong's largest state-owned enterprise, trapping 11 people!

Regular type of geological drill pipe of beneficial mine science and technology?

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