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公开(公告)号：US2490242A
公开(公告)日：1949-12-06
申请号：US73130047
申请日：1947-02-27
Applicant: SARDINE STONE , MARTIN FLOYD A
Inventor： SARDINE STONE , MARTIN FLOYD A
CPC classification number: E01B5/16 , E01B13/02 , E01B2201/04 , E01B2201/08 , E01B2201/10
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