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公开(公告)号：US2633382A
公开(公告)日：1953-03-31
申请号：US23048451
申请日：1951-06-08
Applicant: DUDLEY CHARLES H , MCGRATH EDWIN R
Inventor： DUDLEY CHARLES H , MCGRATH EDWIN R
IPC: E01C23/16
CPC classification number: E01C23/163
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