Method of making rock drill bits,申请号US19480056362-传众专利搜索

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发明名称	Method of making rock drill bits
摘要
申请公布号	US2578351(A)	申请公布日期	1951.12.11
申请号	US19480056362	申请日期	1948.10.25
申请人	RIP-BITS, LIMITED	发明人	GRIFFITHS HUGH MANTON
分类号	B21K5/02;B21K11/00;B21K25/00;E21B10/58	主分类号	B21K5/02
代理机构		代理人
主权项
地址

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