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公开(公告)号：US2440107A
公开(公告)日：1948-04-20
申请号：US60343045
申请日：1945-07-06
Applicant: ROBERT MADDOX NORVAL
Inventor： ROBERT MADDOX NORVAL
IPC: B60C5/20
CPC classification number: B60C5/20 , Y10T152/10612
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