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公开(公告)号：US3345889A
公开(公告)日：1967-10-10
申请号：US45666165
申请日：1965-05-18
Applicant: NORTHROP CORP
Inventor： YUNT FRED W , KEATS BAKER H
IPC: B23Q3/06
CPC classification number: B23Q3/069 , Y10T408/56253
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