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发明名称
Frequency control system
摘要
申请公布号
GB665686(A)
申请公布日期
1952.01.30
申请号
GB19490006946
申请日期
1949.03.14
申请人
SYLVANIA ELECTRIC PRODUCTS INC.
发明人
分类号
H03L7/00
主分类号
H03L7/00
代理机构
代理人
主权项
地址
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