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发明名称
Telephone system requiring different types of pulses
摘要
申请公布号
US2564441(A)
申请公布日期
1951.08.14
申请号
US19490135721
申请日期
1949.12.29
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MCKIM BURTON;STRICKLER WALTER B.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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地址
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