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公开(公告)号：US3328543A
公开(公告)日：1967-06-27
申请号：US31145463
申请日：1963-09-25
Applicant: IBM
Inventor： JOHNSTON RICHARD P , SCHAFFER ROBERT R
CPC classification number: F15C3/002 , H01H3/24 , H01H29/28 , Y10S200/05
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