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公开(公告)号：US3520751A
公开(公告)日：1970-07-14
申请号：US3520751D
申请日：1967-01-30
Applicant: VALVE CORP OF AMERICA
Inventor： CRANFILL JOHN D
CPC classification number: B65C9/1811 , Y10T156/1023 , Y10T156/1041 , Y10T156/107 , Y10T156/109
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