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公开(公告)号：US2831506A
公开(公告)日：1958-04-22
申请号：US58192956
申请日：1956-05-01
Applicant: ALLEN JOHN E , KLOOZ CARL R
Inventor： ALLEN JOHN E , KLOOZ CARL R
IPC: C21B9/12
CPC classification number: C21B9/12 , Y10T137/8225
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