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公开(公告)号：US3356965A
公开(公告)日：1967-12-05
申请号：US43915965
申请日：1965-03-12
Applicant: BERTIL AGDUR NILS , ERIK TERNSTROM ULF
Inventor： BERTIL AGDUR NILS , ERIK TERNSTROM ULF
CPC classification number: H01J17/005 , H03B29/00
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