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发明名称
Automatic message accounting system
摘要
申请公布号
US2767246(A)
申请公布日期
1956.10.16
申请号
US19520264909
申请日期
1952.01.04
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
RETALLACK JOHN B.
分类号
G06F7/42;H04M15/38
主分类号
G06F7/42
代理机构
代理人
主权项
地址
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