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公开(公告)号：US3422328A
公开(公告)日：1969-01-14
申请号：US3422328D
申请日：1965-09-29
Applicant: ACF IND INC
Inventor： ANDERSON CLIFFORD E , BROWN DAVID W
CPC classification number: E21B34/16 , E21B34/04 , E21B34/066 , Y10T137/8242 , Y10T137/87048
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