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shi yong fei zuan zuo zuan li zuan tou
Pages: 24
Year: Issue:  20
Journal: Geology and Prospecting

Keyword:  钻头技术革新勘探队钻粒制造永德生产试验现象利用钻杆;
Abstract: <正> 一○五勘探队杨永德同志在技术革新中,利用废钻杆制造了一批钻粒钻头.经生产试验证明完全可以保证钻进,解决了钻头供不应求的现象,大大的节约了钢材.
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