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发明名称
Telephone system
摘要
申请公布号
US1922879(A)
申请公布日期
1933.08.15
申请号
US19310583222
申请日期
1931.12.26
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
BURGENER JOHN A.
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
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