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发明名称
摘要
申请公布号
JPS56169283(U)
申请公布日期
1981.12.14
申请号
JP19800067990U
申请日期
1980.05.17
申请人
发明人
分类号
G04B47/00;G04G99/00;H04M1/21;(IPC1-7):G04B47/00;G04G1/00
主分类号
G04B47/00
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