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发明名称
摘要
申请公布号
JPS6224897(B2)
申请公布日期
1987.05.30
申请号
JP19780066785
申请日期
1978.06.05
申请人
HITACHI LTD
发明人
EHATA SHIGERU
分类号
H01J31/38;H01J31/26
主分类号
H01J31/38
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