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公开(公告)号：US3503446A
公开(公告)日：1970-03-31
申请号：US3503446D
申请日：1968-05-13
Applicant: CLARENCE W BRANDON , ORPHA B BRANDON , NAT A HARDIN , NEWTON CATHERINE H , HAZEL H WRIGHT , HARVEY B JACOB
Inventor： BRANDON CLARENCE W
CPC classification number: E21B43/2401 , E21B43/003 , E21B43/26
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