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经营范围
发明名称
Improvements in or relating to apparatus for determining phase-shift frequency characteristics of electrical circuits
摘要
申请公布号
GB622993(A)
申请公布日期
1949.05.10
申请号
GB19480000176
申请日期
1945.03.23
申请人
THE SPERRY CORPORATION
发明人
分类号
G01R25/00
主分类号
G01R25/00
代理机构
代理人
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