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发明名称
Telephone systems
摘要
申请公布号
US2979642(A)
申请公布日期
1961.04.11
申请号
US19520323992
申请日期
1952.12.04
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
GOHOREL FERNAND PIERRE
分类号
H04M3/523;H04Q3/00
主分类号
H04M3/523
代理机构
代理人
主权项
地址
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