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发明名称
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摘要
申请公布号
US1893594(A)
申请公布日期
1933.01.10
申请号
US19310530523
申请日期
1931.04.16
申请人
OESTREICH ALBERT R
发明人
OESTREICH ALBERT R.
分类号
G09F1/10;G09F3/20
主分类号
G09F1/10
代理机构
代理人
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