Improvements in protective device for rock drills,申请号GB19280033087-传众专利搜索

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发明名称	Improvements in protective device for rock drills
摘要
申请公布号	GB310947(A)	申请公布日期	1930.02.12
申请号	GB19280033087	申请日期	1928.11.12
申请人	INGERSOLL-RAND COMPANY	发明人
分类号	B25D17/26	主分类号	B25D17/26
代理机构		代理人
主权项
地址

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