Improvements in or relating to rotary earth-boring tools,申请号GB19540016981-传众专利搜索

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发明名称	Improvements in or relating to rotary earth-boring tools
摘要
申请公布号	GB749956(A)	申请公布日期	1956.06.06
申请号	GB19540016981	申请日期	1954.06.09
申请人	JAMES ANTHONY MARTIN;FRANK JOSEPH MARTIN	发明人
分类号	E21B7/28;E21B10/26;E21B10/60	主分类号	E21B7/28
代理机构		代理人
主权项
地址

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