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公开(公告)号：US2793956A
公开(公告)日：1957-05-28
申请号：US27841752
申请日：1952-03-25
Applicant: GEN MOTORS CORP
Inventor： KARL SCHWARTZWALDER , ORTMAN CURTIS D
IPC: C04B28/26
CPC classification number: C04B28/26 , C04B14/10 , C04B14/30 , C04B18/023 , C04B24/08
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