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摘要
申请公布号
US2025478(A)
申请公布日期
1935.12.24
申请号
US19350011849
申请日期
1935.03.19
申请人
JOHN SIRCA
发明人
SIRCA JOHN
分类号
G09F1/14
主分类号
G09F1/14
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代理人
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