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Under and above ground, radio frequency driven element,...

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

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Underground locating using a locating signal transmitter...

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

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Underground pipe locating apparatus

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

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Underground utility locator with a transmitter, a pair of...

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

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Underwater cable locating device

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

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Underwater cable locating device with controlled buoyancy

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

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Utility locator radio link

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

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Variable damping induction coil for metal detection

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

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Variable resolution vector positional display for use with...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
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Wide pulse gated metal detector with improved noise rejection

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

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