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公开(公告)号：US3525072A
公开(公告)日：1970-08-18
申请号：US3525072D
申请日：1967-12-11
Applicant: TEXAS INSTRUMENTS INC
Inventor： BORN ROGER L , NEITZEL EDWIN B , VIGIL ERNEST F
CPC classification number: G01V1/28 , G01V2200/14
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