Improvements in or relating to manhole covers and frames,申请号GB19490000933-传众专利搜索

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发明名称	Improvements in or relating to manhole covers and frames
摘要
申请公布号	GB664152(A)	申请公布日期	1952.01.02
申请号	GB19490000933	申请日期	1949.01.13
申请人	EWART BLANCH HERBERT	发明人
分类号	E02D29/14	主分类号	E02D29/14
代理机构		代理人
主权项
地址

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