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发明名称
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摘要
申请公布号
US2541858(A)
申请公布日期
1951.02.13
申请号
US19470776307
申请日期
1947.09.26
申请人
BOEHM PAUL F
发明人
BOEHM PAUL F.
分类号
G06G1/06
主分类号
G06G1/06
代理机构
代理人
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