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YANCHENG SHENHUA MACHINERY MANUFACTURE CO.,LTD
Add:No. 1299, Jianhu Avenue South Road, Jianhu County
Tel:+86－515－86500588
86500699
Fax:+86－515－86500599
86500699
zip:224761
Email:zxw@ycshenhua.com
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| The drilling quality, the relationship between speed and influence factors |
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