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公开(公告)号：US2842491A
公开(公告)日：1958-07-08
申请号：US58106756
申请日：1956-04-27
Applicant: ROYAL INDUSTRIES
Inventor： ROMULUS TOADER
IPC: C01B13/11
CPC classification number: C01B13/11 , C01B2201/10
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