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发明名称
Group busy signaling at remote toll boards
摘要
申请公布号
US2564088(A)
申请公布日期
1951.08.14
申请号
US19490100040
申请日期
1949.06.18
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
WICKS JOHN
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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