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公开(公告)号：US3052615A
公开(公告)日：1962-09-04
申请号：US53079955
申请日：1955-08-26
Applicant: JOHNS FLOYD L , GRONEMEYER FRED C , DUSBABEK MARK R
Inventor： JOHNS FLOYD L , GRONEMEYER FRED C , DUSBABEK MARK R
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