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公开(公告)号：US2974647A
公开(公告)日：1961-03-14
申请号：US78997459
申请日：1959-01-29
Applicant: SPECIALTIES DEV CORP
Inventor： CAREY THOMAS P
IPC: B64C25/50
CPC classification number: B64C25/50 , Y10T137/87225
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