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发明名称
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摘要
申请公布号
US2474628(A)
申请公布日期
1949.06.28
申请号
US19480028222
申请日期
1948.05.20
申请人
HYMAN HURVITZ
发明人
HURVITZ HYMAN
分类号
G01S7/28;H01J31/06
主分类号
G01S7/28
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