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公开(公告)号：US2920121A
公开(公告)日：1960-01-05
申请号：US70253157
申请日：1957-12-13
Applicant: SISCO WILLIAM E , BOUND BROOK , MOYER MELVIN I , POPKIN SHENIAN
Inventor： SISCO WILLIAM E , BOUND BROOK , MOYER MELVIN I , POPKIN SHENIAN
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