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公开(公告)号：US1874303A
公开(公告)日：1932-08-30
申请号：US51360231
申请日：1931-02-05
Applicant: METROPOLITAN PAVING BRICK COMP
Inventor： KANENGEISER FRED R
IPC: F16L9/08
CPC classification number: F16L9/08
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