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公开(公告)号：US2003398A
公开(公告)日：1935-06-04
申请号：US69004433
申请日：1933-09-19
Applicant: RAMAPO AJAX CORP
Inventor： STRONG JAMES B , HUBER ALBERT F
IPC: E01B7/28
CPC classification number: E01B7/28
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