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公开(公告)号：US2843171A
公开(公告)日：1958-07-15
申请号：US48940355
申请日：1955-02-21
Applicant: HOWE HAROLD H
Inventor： HOWE HAROLD H
CPC classification number: B60C15/0236 , B60B19/06 , B60B21/02
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