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发明名称
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摘要
申请公布号
US2173197(A)
申请公布日期
1939.09.19
申请号
US19380242984
申请日期
1938.11.29
申请人
DONALDSON BROWN WILLIAM
发明人
BROWN WILLIAM DONALDSON
分类号
G09F7/20
主分类号
G09F7/20
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