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公开(公告)号：US1272962A
公开(公告)日：1918-07-16
申请号：US21160118
申请日：1918-01-12
Applicant: JOHAN A SETHER , OLAF C HOFF , CHARLES J CHRISTIANSEN , O A WAAGE , JOHANNESSEN JOHAN E
Inventor： JOHANNESSEN JOHAN E
CPC classification number: D07B7/18
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