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摘要
申请公布号
US1910218(A)
申请公布日期
1933.05.23
申请号
US19320585248
申请日期
1932.01.07
申请人
HETRICK BERNARD D
发明人
HETRICK BERNARD D.
分类号
G09F3/20
主分类号
G09F3/20
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