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公开(公告)号：US1337851A
公开(公告)日：1920-04-20
申请号：US33567619
申请日：1919-11-04
Applicant: ALBIN SWANSON SWAN
Inventor： ALBIN SWANSON SWAN
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/10
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