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Polish rod jack system

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Patent

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Rocker wheel jack for an oil-well pump

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Patent

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Self-adjusting servo mechanism for actuating a friction band ass

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Patent

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Servo-controlled integral stop for use with a...

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Reexamination Certificate

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Single-acting operating cylinder

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Patent

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Three position cylinder

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Reexamination Certificate

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Three-position stop type swing actuator

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Reexamination Certificate

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Vacuum control device for the displacement of an element between

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Patent

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Variable displacement reciprocating piston machine

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Patent

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Variable stroke assembly

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Reexamination Certificate

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