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发明名称
Signaling system
摘要
申请公布号
US1933680(A)
申请公布日期
1933.11.07
申请号
US19270237113
申请日期
1927.12.01
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
OHL RUSSELL S.
分类号
H04Q1/30
主分类号
H04Q1/30
代理机构
代理人
主权项
地址
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