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1.发明授权
公开(公告)号：US3313979A
公开(公告)日：1967-04-11
申请号：US20646662
申请日：1962-06-29
Applicant: MAX PLANCK GESELLSCHAFT
Inventor： LANDAUER GERD J
CPC classification number: H01J25/005 , H03B9/00 , H05H1/00
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