METHOD OF DEEP BORE DRILLING,申请号USD3489040-传众专利搜索

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发明名称	METHOD OF DEEP BORE DRILLING
摘要
申请公布号	US3489040(A)	申请公布日期	1970.01.13
申请号	USD3489040	申请日期	1967.08.23
申请人	DONALD R. WESTHOFF	发明人	DONALD R. WESTHOFF
分类号	B23B41/02;B23B41/14;(IPC1-7):B23B35/00	主分类号	B23B41/02
代理机构		代理人
主权项
地址

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