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公开(公告)号：US3229955A
公开(公告)日：1966-01-18
申请号：US14698361
申请日：1961-10-23
Applicant: FERRO MFG CORP
Inventor： HANSEN OSCAR C , JOSEPH PICKLES , WILLIAM GILMORE
CPC classification number: B60N2/2231 , B60N2/0232
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