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公开(公告)号：US1348418A
公开(公告)日：1920-08-03
申请号：US34995720
申请日：1920-01-07
Applicant: HOLLENBECK WILLIAM H
Inventor： HOLLENBECK WILLIAM H
IPC: E01C5/14
CPC classification number: E01C5/14 , E01C2201/02
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