Drill bit support,申请号US19430505993-传众专利搜索

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发明名称	Drill bit support
摘要
申请公布号	US2380330(A)	申请公布日期	1945.07.10
申请号	US19430505993	申请日期	1943.10.12
申请人	RINGLER RUDOLPH M	发明人	RINGLER RUDOLPH M.
分类号	B23B31/20;B23B51/00	主分类号	B23B31/20
代理机构		代理人
主权项
地址

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