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公开(公告)号：US2520687A
公开(公告)日：1950-08-29
申请号：US61976845
申请日：1945-10-02
Applicant: GEN MOTORS CORP
Inventor： MARTIN THOMAS B , WILLIAMS HARRY R
IPC: B64C11/14
CPC classification number: B64C11/14 , Y10T292/432
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