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公开(公告)号：US3499353A
公开(公告)日：1970-03-10
申请号：US3499353D
申请日：1968-02-14
Applicant: HARVEY A EWELL
Inventor： EWELL HARVEY A
CPC classification number: B23B51/00 , B23B51/0406 , B25H1/0064 , Y10T408/34 , Y10T408/36 , Y10T408/3822 , Y10T408/385
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