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1.发明授权Dispenser cathode made of tungsten powder having a grain size of less than three microns 失效具有不到三个微米的颗粒尺寸的钨粉的分配器阴极
公开(公告)号：US3458749A
公开(公告)日：1969-07-29
申请号：US3458749D
申请日：1967-06-06
Applicant: PHILIPS CORP
CPC classification number: H01J1/28
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