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11.发明专利
公开(公告)号：ZA7904757B
公开(公告)日：1980-09-24
申请号：ZA7904757
申请日：1979-09-07
Applicant: BETHLEHEM STEEL CORP
Inventor： AUSTEN A , HUMPHRIES D
CPC classification number: F16L9/12 , B29C47/0004 , B29C47/0023
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