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发明名称
Telephone privacy
摘要
申请公布号
US2406352(A)
申请公布日期
1946.08.27
申请号
US19420430370
申请日期
1942.02.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MUNSON WILDEN A.
分类号
H04K1/06
主分类号
H04K1/06
代理机构
代理人
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地址
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