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发明名称
Focus device
摘要
申请公布号
US2801356(A)
申请公布日期
1957.07.30
申请号
US19560560741
申请日期
1956.01.23
申请人
HEPPNER MANUFACTURING CO.
发明人
HEPPNER ELMORE A.
分类号
H01J29/68
主分类号
H01J29/68
代理机构
代理人
主权项
地址
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