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公开(公告)号：US2313673A
公开(公告)日：1943-03-09
申请号：US40418641
申请日：1941-07-26
Applicant: METROPOLITAN PAVING BRICK COMP
Inventor： SEVER DEAN R , RENKERT DONALD J
IPC: E01F9/06
CPC classification number: E01F9/553
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