Drill steel retainer,申请号US19290367486-传众专利搜索

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发明名称	Drill steel retainer
摘要
申请公布号	US1866863(A)	申请公布日期	1932.07.12
申请号	US19290367486	申请日期	1929.05.31
申请人	THE CLEVELAND ROCK DRILL COMPANY	发明人	RICHARDSON LED L.
分类号	B25D17/08	主分类号	B25D17/08
代理机构		代理人
主权项
地址

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