Improvements in hammer rock drills,申请号GB19310014314-传众专利搜索

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发明名称	Improvements in hammer rock drills
摘要
申请公布号	GB364487(A)	申请公布日期	1932.01.07
申请号	GB19310014314	申请日期	1931.05.14
申请人	GUNNAR BERGSTROM	发明人
分类号	B25D9/12	主分类号	B25D9/12
代理机构		代理人
主权项
地址

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