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摘要
申请公布号
US2152623(A)
申请公布日期
1939.04.04
申请号
US19380210752
申请日期
1938.05.28
申请人
BELKNAP WILLIAM L;MEYER EDWIN L
发明人
BELKNAP WILLIAM L.;MEYER EDWIN L.
分类号
G09F13/04
主分类号
G09F13/04
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