Hollow drill for the impact drilling of rocks and other minerals,申请号GB19540007943-传众专利搜索

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发明名称	Hollow drill for the impact drilling of rocks and other minerals
摘要
申请公布号	GB755260(A)	申请公布日期	1956.08.22
申请号	GB19540007943	申请日期	1954.03.18
申请人	HERMANN HEMSCHEIDT	发明人
分类号	E21B17/04	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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