4. Communications, electrical: acoustic wave systems and devices
  5. Seismic prospecting

Per Helgerud

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Method for synchronization of systems for seismic surveys, toget

Communications – electrical: acoustic wave systems and devices – Seismic prospecting
Patent

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System for depth control of a marine deflector

Ships – Towing or pushing – Steering
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1962470

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