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公开(公告)号：US3397311A
公开(公告)日：1968-08-13
申请号：US43224465
申请日：1965-02-12
Applicant: BOEING CO
Inventor： SAARI JOHN M , SCHOEN RICHARD L , DAYTON IRVING E
CPC classification number: H01J49/486 , H01J49/004
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