Kusiyana pakati peSimende Retainers uye Bridge Plugs
Kuchera & Kugaya Maitiro Akanakisisa: Kana mamiriro acho ari kuita mabasa ekuchera kana kugaya (junk mill), maitiro anokurudzirwa ndeaya anotevera: Shandisa tricone Bit (IADC Bit Codes 2-1, 2-2, 2-3, 2- 4, uye 3-1) - yepakati yakaoma kuumbwa. PDC Bit haisi ...
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