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1.发明授权
公开(公告)号：US2750516A
公开(公告)日：1956-06-12
申请号：US29636352
申请日：1952-06-30
Applicant: CIVILFORSVARSSTYRELSEN
Inventor： PETER AMBROSEN JOHAN
IPC: H01J47/04
CPC classification number: H01J47/04
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