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Balanced passive bandpass filter and preamplifier for a receiver

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

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Balanced search loop for metal detector

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

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Belt-supported swingable metal detector

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

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Bobbin for a magnetic sensor

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

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Bore location system

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

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Bore location system

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

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Bore location system

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

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Bore location system

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

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Borehole antenna array for determining radar incidence direction

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

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Borehole apparatus for investigating subsurface earth formations

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

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Borehole conductivity simulator verification and transverse...

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

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Borehole conductivity simulator verification and transverse...

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

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Borehole conductivity simulator verification and transverse...

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

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Borehole conductivity simulator verification and transverse...

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

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Borehole current correction for tilted or transverse...

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

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Borehole current correction methods and apparatus

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

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Borehole fracture detection using magnetic powder

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

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Borehole induction coil transmitter

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

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Borehole logging tool utilizing electromagnetic energy in the de

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

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Borehole logging tools and methods using reflected electromagnet

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

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