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发明名称
Volume-control system
摘要
申请公布号
US1950145(A)
申请公布日期
1934.03.06
申请号
US19300478195
申请日期
1930.08.27
申请人
WIRED RADIO, INC.
发明人
OLSON JOHN
分类号
H03G3/22
主分类号
H03G3/22
代理机构
代理人
主权项
地址
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