Art of protecting coal and like,申请号US19390286809-传众专利搜索

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发明名称	Art of protecting coal and like
摘要
申请公布号	US2204781(A)	申请公布日期	1940.06.18
申请号	US19390286809	申请日期	1939.07.27
申请人	WATTLES GEORGE M	发明人	WATTLES GEORGE M.
分类号	B65G3/02	主分类号	B65G3/02
代理机构		代理人
主权项
地址

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