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发明名称
摘要
申请公布号
GB1234186(A)
申请公布日期
1971.06.03
申请号
GBD1234186
申请日期
1967.09.05
申请人
发明人
分类号
H04H20/77;H04H40/18;H04N7/10
主分类号
H04H20/77
代理机构
代理人
主权项
地址
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