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发明名称
Telephone system
摘要
申请公布号
US2465372(A)
申请公布日期
1949.03.29
申请号
US19450610165
申请日期
1945.08.10
申请人
GROH BERNARD C
发明人
GROH BERNARD C.
分类号
H04Q1/30
主分类号
H04Q1/30
代理机构
代理人
主权项
地址
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