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公开(公告)号：US2769541A
公开(公告)日：1956-11-06
申请号：US34783153
申请日：1953-04-09
Applicant: UNITED STATES PIPE FOUNDRY
Inventor： PERRY RICHMOND E
IPC: B03D1/001
CPC classification number: B03D1/008 , B03D1/002 , B03D1/006 , B03D2201/007 , B03D2201/02 , B03D2203/04
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