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发明名称
Volume control
摘要
申请公布号
US1969883(A)
申请公布日期
1934.08.14
申请号
US19290390879
申请日期
1929.09.07
申请人
HAMMOND JR JOHN HAYS
发明人
JR. JOHN HAYS HAMMOND,
分类号
H03G3/22
主分类号
H03G3/22
代理机构
代理人
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