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公开(公告)号：US2890627A
公开(公告)日：1959-06-16
申请号：US38141453
申请日：1953-09-21
Applicant: GEN MOTORS CORP
Inventor： ONKSEN GEORGE W , REYNOLDS EUGENE S
IPC: B23C3/20
CPC classification number: B23C3/20 , Y10T409/303808
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