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发明名称
Call indicator
摘要
申请公布号
US2223927(A)
申请公布日期
1940.12.03
申请号
US19390282869
申请日期
1939.07.05
申请人
UNITED STATES INSTRUMENT CORPORATION
发明人
WARNKE HERBERT R.
分类号
H04M1/52;H04M1/57;H04M3/64;H04M9/00
主分类号
H04M1/52
代理机构
代理人
主权项
地址
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