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摘要
申请公布号
US3156057(A)
申请公布日期
1964.11.10
申请号
US19620178854
申请日期
1962.03.12
申请人
COOPER DUANE E
发明人
COOPER DUANE E.
分类号
H04M1/272
主分类号
H04M1/272
代理机构
代理人
主权项
地址
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