4. Communications: electrical
  5. Selective
  6. Having electron beam device

Mark Ian Howell

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Apparatus for and methods of seismic prospecting

Communications: electrical – Selective – Having electron beam device
Patent

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Method and apparatus for determining the presence of or absence

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent

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Method and apparatus for locating buried conductors in the prese

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

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Method and apparatus for the location of remote conductors by an

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

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Method and apparatus for use in location of conductors

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1231311

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