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公开(公告)号：US2880451A
公开(公告)日：1959-04-07
申请号：US57617656
申请日：1956-04-04
Applicant: BECK CHYRUS L , BECK GUY R
Inventor： BECK CHYRUS L , BECK GUY R
CPC classification number: E05F1/1008 , E05F1/1223 , E05Y2201/474 , Y10T16/2766 , Y10T16/286
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