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发明名称
Electromagnetic apparatus
摘要
申请公布号
US2218609(A)
申请公布日期
1940.10.22
申请号
US19390261696
申请日期
1939.03.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HENNING HARLEY A.
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
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地址
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