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公开(公告)号：US3499621A
公开(公告)日：1970-03-10
申请号：US3499621D
申请日：1967-09-06
Applicant: MC DONNELL DOUGLAS CORP
Inventor： BOEHRINGER WILFRED E , KRAMER LOUIS T , LITTLE JANE
IPC: B64C25/50
CPC classification number: B64C25/505
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