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发明名称
Switch or commutating means
摘要
申请公布号
US1812828(A)
申请公布日期
1931.06.30
申请号
US19280313301
申请日期
1928.10.18
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GRAY FRANK
分类号
H04N3/12
主分类号
H04N3/12
代理机构
代理人
主权项
地址
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