Apparatus for mining,申请号US19290408710-传众专利搜索

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发明名称	Apparatus for mining
摘要
申请公布号	US1841907(A)	申请公布日期	1932.01.19
申请号	US19290408710	申请日期	1929.11.21
申请人	BERWIND-WHITE COAL MINING COMPANY	发明人	NEWBAKER EDWARD J.
分类号	E21B7/02	主分类号	E21B7/02
代理机构		代理人
主权项
地址

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