Bucket attachment for mine shaft excavations,申请号US19480048646-传众专利搜索

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发明名称	Bucket attachment for mine shaft excavations
摘要
申请公布号	US2597711(A)	申请公布日期	1952.05.20
申请号	US19480048646	申请日期	1948.09.10
申请人	DONALD EDWARD J	发明人	DONALD EDWARD J.
分类号	E21D1/03	主分类号	E21D1/03
代理机构		代理人
主权项
地址

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