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公开(公告)号：US3443456A
公开(公告)日：1969-05-13
申请号：US3443456D
申请日：1966-09-15
Applicant: WILLIAM VANGOR
Inventor： VANGOR WILLIAM
CPC classification number: B23Q16/065 , Y10T74/1453 , Y10T74/1465
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