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发明名称
Signaling system
摘要
申请公布号
US1944216(A)
申请公布日期
1934.01.23
申请号
US19310540825
申请日期
1931.05.29
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BURTON EVERETT T.
分类号
H03F1/33;H03F3/32;H03F3/44
主分类号
H03F1/33
代理机构
代理人
主权项
地址
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