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公开(公告)号：US1908790A
公开(公告)日：1933-05-16
申请号：US41918530
申请日：1930-01-07
Applicant: WICKWIRE SPENCER STEEL COMPANY
Inventor： PETER ROBERTSON , WOODMAN FRANCIS N
IPC: F24D19/00
CPC classification number: F24D19/0082
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