Lock type manhole cover,申请号US19490086624-传众专利搜索

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发明名称	Lock type manhole cover
摘要
申请公布号	US2697389(A)	申请公布日期	1954.12.21
申请号	US19490086624	申请日期	1949.04.11
申请人	HECKMAN EARLE D	发明人	HECKMAN EARLE D.
分类号	B63B19/14;E02D29/14	主分类号	B63B19/14
代理机构		代理人
主权项
地址

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