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公开(公告)号：US2904897A
公开(公告)日：1959-09-22
申请号：US64632657
申请日：1957-03-15
Applicant: GEN MOTORS CORP
Inventor： WHYTE RONAL H , CLEMENT RICHARD T
IPC: D06F95/00
CPC classification number: D06F95/004
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