POSITION RESTORING DEVICES FOR MINE ROOF PROPS,申请号CAD890151-传众专利搜索

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发明名称	POSITION RESTORING DEVICES FOR MINE ROOF PROPS
摘要
申请公布号	CA890151(A)	申请公布日期	1972.01.11
申请号	CAD890151	申请日期
申请人	KARL M. GROETSCHEL	发明人	KARL M. GROETSCHEL
分类号		主分类号
代理机构		代理人
主权项
地址

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