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公开(公告)号：US1450740A
公开(公告)日：1923-04-03
申请号：US41868720
申请日：1920-10-22
Applicant: HELMICK MILTON J , AGNEW THOMAS L
Inventor： HELMICK MILTON J , AGNEW THOMAS L
IPC: B60B9/20
CPC classification number: B60B9/20
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