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公开(公告)号：US1990465A
公开(公告)日：1935-02-05
申请号：US62540932
申请日：1932-07-28
Applicant: JOHNSON CHARLES H , OTTO JOSLIN
Inventor： JOHNSON CHARLES H , OTTO JOSLIN
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/08 , E01B2201/10
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