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发明名称
Signal card file
摘要
申请公布号
US2176183(A)
申请公布日期
1939.10.17
申请号
US19380203948
申请日期
1938.04.23
申请人
E. STANLEY WRIGHT
发明人
KRIEG JULIUS A.
分类号
B42F17/02
主分类号
B42F17/02
代理机构
代理人
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