Improvements in the bits or cutters of rotary drills for drilling in coal, soft rocks and the like, and in the method of manufacture thereof,申请号GB19400005012-传众专利搜索

发明名称	Improvements in the bits or cutters of rotary drills for drilling in coal, soft rocks and the like, and in the method of manufacture thereof
摘要
申请公布号	GB538212(A)	申请公布日期	1941.07.24
申请号	GB19400005012	申请日期	1940.03.18
申请人	PILOT TOOLS (PROPRIETARY), LIMITED;COLIN OLIVER DEACON	发明人
分类号	E21B10/54	主分类号	E21B10/54
代理机构		代理人
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