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发明名称
Testing system
摘要
申请公布号
US1820116(A)
申请公布日期
1931.08.25
申请号
US19300487301
申请日期
1930.10.08
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BURNS ROY W.
分类号
H04M3/22
主分类号
H04M3/22
代理机构
代理人
主权项
地址
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