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Male and female screw rotor assembly with specific tooth flanks

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent

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Meshing helical rotors

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate

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Method of reducing system pressure pulsation for positive...

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate

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Methods and apparatus for unloading a screw compressor

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate

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Modular downhole multiphase pump

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate

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Molecular drag pump with rotors moving in same direction

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent

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Multi-rotor helical-screw compressor with discharge side...

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate

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Multi-stage helical screw rotor

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate

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