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http://www.google.com.au/patents/US3278748?utm_source=gb-gplus-share
Patent US3278748 - QUASI-STATIONARY WELL LOGGING METHOD AND APPARATUS
QUASI-STATIONARY WELL LOGGING METHOD AND APPARATUS
Norman J. Powell et al
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Description
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Patent number
: 3278748
Filing date
: 8 Aug 1963
Issue date
: 11 Oct 1966
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