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公开(公告)号：US3518390A
公开(公告)日：1970-06-30
申请号：US3518390D
申请日：1968-07-19
Applicant: NIPPON ELECTRIC CO
Inventor： SASAMOTO TAKESHI
CPC classification number: C23C26/02 , H01H1/0201 , H01H1/023 , H01H2001/0208
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