Step insert for concrete pipe sections,申请号US19640335257-传众专利搜索

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发明名称	Step insert for concrete pipe sections
摘要
申请公布号	US3299984(A)	申请公布日期	1967.01.24
申请号	US19640335257	申请日期	1964.01.02
申请人	SVEDAHL CLIFFORD L	发明人	SVEDAHL CLIFFORD L.
分类号	E06C9/04	主分类号	E06C9/04
代理机构		代理人
主权项
地址

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