Rock drilling machine of the hammer type,申请号US19290373683-传众专利搜索

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发明名称	Rock drilling machine of the hammer type
摘要
申请公布号	US1820245(A)	申请公布日期	1931.08.25
申请号	US19290373683	申请日期	1929.06.20
申请人	SAMUEL POTTER HENRY	发明人	POTTER HENRY SAMUEL
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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