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公开(公告)号：US1828892A
公开(公告)日：1931-10-27
申请号：US39830529
申请日：1929-10-09
Applicant: FELTON WILLIAM T
Inventor： FELTON WILLIAM T
CPC classification number: E01F9/627 , E01F9/65 , Y10T403/459
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