Improvements in and relating to joints for mine arch section metal bars,申请号GB19330025065-传众专利搜索

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发明名称	Improvements in and relating to joints for mine arch section metal bars
摘要
申请公布号	GB423611(A)	申请公布日期	1935.02.05
申请号	GB19330025065	申请日期	1933.09.11
申请人	FERDINAND RICHARDS	发明人
分类号	E21D11/22	主分类号	E21D11/22
代理机构		代理人
主权项
地址

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