Improvements in and connected with chocks for use in mines,申请号GB19300017653-传众专利搜索

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发明名称	Improvements in and connected with chocks for use in mines
摘要
申请公布号	GB356275(A)	申请公布日期	1931.09.07
申请号	GB19300017653	申请日期	1930.06.06
申请人	STANLEY WALTON-BROWN	发明人
分类号	E21D15/48;E21D15/52;E21D15/60	主分类号	E21D15/48
代理机构		代理人
主权项
地址

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