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发明名称
Retardation-coil system
摘要
申请公布号
US1753325(A)
申请公布日期
1930.04.08
申请号
US19280250163
申请日期
1928.01.28
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WHITTLE HORACE
分类号
H04M11/06
主分类号
H04M11/06
代理机构
代理人
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