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发明名称
Focusing device
摘要
申请公布号
US2533688(A)
申请公布日期
1950.12.12
申请号
US19500141473
申请日期
1950.01.31
申请人
QUAM-NICHOLS COMPANY
发明人
QUAM JAMES P.
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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