发明名称 |
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摘要 |
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申请公布号 |
FR739024(A) |
申请公布日期 |
1932.12.31 |
申请号 |
FRD739024 |
申请日期 |
|
申请人 |
|
发明人 |
|
分类号 |
H01J25/72 |
主分类号 |
H01J25/72 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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