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公开(公告)号：US1031972A
公开(公告)日：1912-07-09
申请号：US1911659517
申请日：1911-11-10
Applicant: SVENSEN OLAF T
Inventor： SVENSEN OLAF T
CPC classification number: B60B21/06 , B60B21/025 , B60B2360/10
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