pressure well are also available. technical characteristics drill collar are made of modified alloy steel fully heat treated in order to obtain high hardness. cold rolling processing the thread ends to achieve good pressure-bearing ability, anti wearing out and longer life-span. thread phosphor or copper...
mechanical strength ability with overall good performance. the thread is cut by the special-purpose numerical control lathe which keeps the rod body still when cutting the threads. the special process could ensure the high precision of the thread with better reliability and life-span. coupling phosphor or copper...
table levels of debt and characteristics of ‐ year olds compared with all uk adults table demographics and characteristics of ‐ year olds compared with all uk adults table levels of debt of ‐ year olds compared with all uk adults table investable assets held by ‐ year olds compared with all uk adults...
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