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发明名称
Electronic tracing system
摘要
申请公布号
US2515057(A)
申请公布日期
1950.07.11
申请号
US19470768557
申请日期
1947.08.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
PIERCE JOHN R.
分类号
G08C21/00
主分类号
G08C21/00
代理机构
代理人
主权项
地址
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