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发明名称
摘要
申请公布号
JPS4722721(U)
申请公布日期
1972.11.14
申请号
JP19710015143U
申请日期
1971.03.08
申请人
发明人
分类号
E04F13/21;E04F13/14;(IPC1-7):E04F13/14
主分类号
E04F13/21
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