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发明名称
Conference circuit
摘要
申请公布号
US2880276(A)
申请公布日期
1959.03.31
申请号
US19540420779
申请日期
1954.04.05
申请人
GENERAL DYNAMICS CORPORATION
发明人
PHARIS WILLIAM W.
分类号
H04M3/56
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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