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Apparatus for locating concealed electrical conductors

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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Apparatus for logging the resistivity of a geological rock...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate

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Apparatus for measuring formation resistivity through a conducti

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent

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Apparatus for measuring resistivity of an earth formation using

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent

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Apparatus for measuring terrain conductivity

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate

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Apparatus for measuring transient electric earth current to pred

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent

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Apparatus for microinductive investigation of earth formations

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent

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Apparatus for microinductive investigation of earth formations

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent

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Apparatus for microinductive investigation of earth formations

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent

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Apparatus for microinductive investigation of earth formations w

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent

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Apparatus for observing the passage of a pig in a pipeline

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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Apparatus for predicting earthquakes and other terrestrial...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By magnetic means
Reexamination Certificate

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Apparatus for prospecting for geological formation

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent

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Apparatus for reducing rotation of a towed airborne article

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By aerial survey
Reexamination Certificate

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Apparatus for remotely indicating pipeline pig including a senso

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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Apparatus for supplying AC current to an underwater cable

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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Apparatus for the detection of metal objects located within a po

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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Apparatus having a pair of magnetic field generating cables for

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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Apparatus including a magnetometer having a pair of U-shaped cor

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent

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Apparatus including a pair of automatic gain controlled amplifie

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent

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