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发明名称
Telephone system
摘要
申请公布号
US2102137(A)
申请公布日期
1937.12.14
申请号
US19360087184
申请日期
1936.06.25
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
SPERRY ARTHUR B.
分类号
H04M7/10;H04Q3/00
主分类号
H04M7/10
代理机构
代理人
主权项
地址
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