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发明名称
Sound signal apparatus
摘要
申请公布号
US2340604(A)
申请公布日期
1944.02.01
申请号
US19400329059
申请日期
1940.04.11
申请人
WALLACE & TIERNAN PRODUCTS, INC.
发明人
MACKAY JOHN R.
分类号
G10K9/13
主分类号
G10K9/13
代理机构
代理人
主权项
地址
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