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公开(公告)号：US3373827A
公开(公告)日：1968-03-19
申请号：US55753166
申请日：1966-06-14
Applicant: NATIONAL SCIENCE FOUNDATION USA
Inventor： BIRON JULES N , JONES DURWARD B , SIMS DARRELL L
CPC classification number: E21B7/124 , E21B25/16 , E21B25/18 , Y10S173/01
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