4. Acoustics
  5. Wave coupling
  6. Earth

Den Norske Stats Oljeselskap A.S

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Apparatus for guiding and stopping an anchor chain on a...

Ships – Cable stoppers – Chain
Reexamination Certificate

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Apparatus for measuring permeability of a rock sample

Measuring and testing – With fluid pressure – Porosity or permeability
Patent

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Ball valve and actuator for operating valves and the like

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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Cementing apparatus and method for execution of cementing operat

Wells – Processes – Cementing – plugging or consolidating
Patent

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Ceramic coating

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent

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