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发明名称
Modulation system
摘要
申请公布号
US2244756(A)
申请公布日期
1941.06.10
申请号
US19390288134
申请日期
1939.08.03
申请人
INTERNATIONAL TELEPHONE DEVELOPMENT CO., INC.
发明人
ALFORD ANDREW
分类号
H03C7/02;H03H7/48
主分类号
H03C7/02
代理机构
代理人
主权项
地址
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