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Downhole pump

Pumps – Expansible chamber type – Relatively movable serial distributors
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Downhole pump with standing valve assembly which guides the ball

Pumps – Expansible chamber type – Relatively movable serial distributors
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Dual-piston reciprocating pump assembly

Pumps – Expansible chamber type – Relatively movable serial distributors
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Fluid pump

Pumps – Expansible chamber type – Relatively movable serial distributors
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Fluid pump

Pumps – Expansible chamber type – Relatively movable serial distributors
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Method and apparatus for compressing gas

Pumps – Expansible chamber type – Relatively movable serial distributors
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Pump barrel seal assembly including seal/actuator element

Pumps – Expansible chamber type – Relatively movable serial distributors
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Pump barrel valve assembly including seal/actuator element

Pumps – Expansible chamber type – Relatively movable serial distributors
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Rotating piston for ball and seat valve assembly and downhole pu

Pumps – Expansible chamber type – Relatively movable serial distributors
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Secondary pump feed apparatus

Pumps – Expansible chamber type – Relatively movable serial distributors
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Traveling valve assembly

Pumps – Expansible chamber type – Relatively movable serial distributors
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Travelling valve assembly for a fluid pump

Pumps – Expansible chamber type – Relatively movable serial distributors
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Valve assembly

Pumps – Expansible chamber type – Relatively movable serial distributors
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