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发明名称
Coin control circuit for telephone systems
摘要
申请公布号
US2786890(A)
申请公布日期
1957.03.26
申请号
US19530368774
申请日期
1953.07.17
申请人
GENERAL DYNAMICS CORPORATION
发明人
KESSLER FRANK
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
主权项
地址
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