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公开(公告)号：US1757860A
公开(公告)日：1930-05-06
申请号：US28839728
申请日：1928-06-26
Applicant: RICHARD HALL JOHN , CLARENCE MCLEOD KENNETH , BURGESS HEATLEY OWEN
Inventor： RICHARD HALL JOHN , CLARENCE MCLEOD KENNETH , BURGESS HEATLEY OWEN
IPC: B60J1/20
CPC classification number: B60J1/2011
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