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发明名称
Adjustable sound level control for audible signals of the vibratory type
摘要
申请公布号
US2875433(A)
申请公布日期
1959.02.24
申请号
US19560630793
申请日期
1956.12.27
申请人
WHEELOCK SIGNALS, INC.
发明人
BEAN ROSCOE D.
分类号
G10K1/063
主分类号
G10K1/063
代理机构
代理人
主权项
地址
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