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发明名称
摘要
申请公布号
JPS5289167(U)
申请公布日期
1977.07.04
申请号
JP19750178609U
申请日期
1975.12.26
申请人
发明人
分类号
G04B29/00;G04C3/00;G04F7/04;G04G21/00;G04G99/00;(IPC1-7):G04C3/00
主分类号
G04B29/00
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