4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Below-ground storage of motivating energy

Knut V. Horvei

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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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Converter group and pressure converter for use therein

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent

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Pressure converter

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent

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Rotatable valve having upper and lower parts

Fluid handling – With repair – tapping – assembly – or disassembly means – Assembling – disassembling – or removing cartridge type valve
Patent

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Valve arrangement

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

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Profile ID: LFUS-PAI-P-1094625

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