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公开(公告)号：US2728555A
公开(公告)日：1955-12-27
申请号：US21972851
申请日：1951-04-06
Applicant: TEXAS INSTRUMENTS INC
Inventor： BURG KENNETH E , WARREN MANN NEIL , TOOMEY EUGENE J , VANCE STEWART E
IPC: E21B7/02
CPC classification number: E21B7/028
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