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经营范围
发明名称
Improvements in or relating to telephone instruments
摘要
申请公布号
GB399212(A)
申请公布日期
1933.10.02
申请号
GB19320009334
申请日期
1932.03.31
申请人
ISAIAH HALL
发明人
分类号
H04M1/667
主分类号
H04M1/667
代理机构
代理人
主权项
地址
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