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发明名称
Telephone system
摘要
申请公布号
US1963769(A)
申请公布日期
1934.06.19
申请号
US19330697546
申请日期
1933.11.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WILLIFORD OSCAR H.
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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