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公开(公告)号：US3550489A
公开(公告)日：1970-12-29
申请号：US3550489D
申请日：1968-10-25
Applicant: LLOYD W KUHN
Inventor： KUHN LLOYD W , FONTAINE WILLIAM J
CPC classification number: B23Q16/04 , Y10T74/14 , Y10T82/2587
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