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发明名称
Sign
摘要
申请公布号
US1989781(A)
申请公布日期
1935.02.05
申请号
US19330700187
申请日期
1933.11.29
申请人
ZAK SYLVESTER J
发明人
ZAK SYLVESTER J.
分类号
G09F21/04
主分类号
G09F21/04
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