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Drill Collar Is At The Bottom Of The Drill String And Is The Major Component Of The Bha. Drill Collar Is An Important Part Of Petroleum Drilling |
| Create: 08/10/2017 |
| Expired Date: | 08/23/2019 |
| Category: | Animal&Plant&Agri Supplier |
| Message: | Drill Collar Is At The Bottom Of The Drill String And Is The Major Component Of The Bha. Drill Collar Is An Important Part Of Petroleum Drilling,Cylinder Forging url:http://www.freeforgingchina.com |
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| City: | LAIWU[CN]
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| Location: |
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