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发明名称
Electrical communication apparatus
摘要
申请公布号
US2274008(A)
申请公布日期
1942.02.24
申请号
US19390310906
申请日期
1939.12.26
申请人
WALTER SPIEGEL
发明人
SPIEGEL WALTER
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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