Telescopic pit prop,申请号US19630316210-传众专利搜索

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发明名称	Telescopic pit prop
摘要
申请公布号	US3220686(A)	申请公布日期	1965.11.30
申请号	US19630316210	申请日期	1963.10.15
申请人	GUARDIAN MINING PROPS LIMITED	发明人	GOLD RICHARD LUCIUS
分类号	E21D15/30;E21D15/44;E21D15/55	主分类号	E21D15/30
代理机构		代理人
主权项
地址

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