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发明名称
Improvements in telephone dial mechanisms
摘要
申请公布号
GB342552(A)
申请公布日期
1931.02.05
申请号
GB19300005694
申请日期
1930.02.20
申请人
SMITH ARNOLD CONKLIN
发明人
分类号
H04M1/32
主分类号
H04M1/32
代理机构
代理人
主权项
地址
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