Support for mine roofs,申请号US19380201119-传众专利搜索

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发明名称	Support for mine roofs
摘要
申请公布号	US2210788(A)	申请公布日期	1940.08.06
申请号	US19380201119	申请日期	1938.04.09
申请人	MARTIN-HARDSOCG COMPANY	发明人	ANDERSON CECIL R.
分类号	E21D11/34	主分类号	E21D11/34
代理机构		代理人
主权项
地址

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