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摘要
申请公布号
US2563957(A)
申请公布日期
1951.08.14
申请号
US19490123456
申请日期
1949.10.25
申请人
PLACK ALBERT R
发明人
PLACK ALBERT R.
分类号
G11B33/04
主分类号
G11B33/04
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