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发明名称
Improvements in telephone systems
摘要
申请公布号
GB787251(A)
申请公布日期
1957.12.04
申请号
GB19540030693
申请日期
1954.10.25
申请人
IWASAKI TSUSHINKI KABUSHIKI KAISHA
发明人
SEKI HIDEO
分类号
H04B1/66
主分类号
H04B1/66
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代理人
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