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发明名称
Method of producing sound band matrices
摘要
申请公布号
US2352052(A)
申请公布日期
1944.06.20
申请号
US19400359975
申请日期
1940.10.05
申请人
HUGO WESTERKAMP
发明人
WESTERKAMP HUGO
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
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