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公开(公告)号：US2884002A
公开(公告)日：1959-04-28
申请号：US69006657
申请日：1957-10-14
Applicant: GEOLOGRAPH CO
Inventor： MELTON JAMES O , CARPENTER IRVIN M
IPC: E21B21/10
CPC classification number: E21B21/10 , Y10T137/7504 , Y10T137/773
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