Improvements in or relating to roof supports adjacent to the working faces of mines of coal and other stratified minerals,申请号GB19580017613-传众专利搜索

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发明名称	Improvements in or relating to roof supports adjacent to the working faces of mines of coal and other stratified minerals
摘要
申请公布号	GB839942(A)	申请公布日期	1960.06.29
申请号	GB19580017613	申请日期	1958.06.03
申请人	FREDERICK COLIN SWALLOW	发明人
分类号	E21D17/04	主分类号	E21D17/04
代理机构		代理人
主权项
地址

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