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发明名称
Privacy testing system
摘要
申请公布号
US2153706(A)
申请公布日期
1939.04.11
申请号
US19370152839
申请日期
1937.07.09
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BASCOM EARLE CLARK
分类号
H04K1/04
主分类号
H04K1/04
代理机构
代理人
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地址
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