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发明名称
摘要
申请公布号
CH301371(A4)
申请公布日期
1972.09.15
申请号
CHD301371D
申请日期
1971.03.02
申请人
发明人
分类号
G04B19/247;G04B19/253
主分类号
G04B19/247
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代理人
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地址
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