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Patent
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G01V 1/40 (2006.01) G01V 1/22 (2006.01)
Patent
CA 2004204
ABSTRACT OF THE DISCLOSURE Acoustical signals arc transmitted through a drill string by canceling upward mov- ing acoustical noise and by preconditioning the data in recognition of the comb filter impedance characteristics of the drill string.
Drumheller Douglas S.
Sandia Corporation
Swabey Ogilvy Renault
LandOfFree
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