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Remotely releasable safety belt buckle
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Oil well pump
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Multiple production pump
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Sand and gas deflector for oil well pumps
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Reciprocal piston oil well pump
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Sand trapping sucker-rod for piston type oil well pump
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Double acting mercury piston oil well pump
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Fluid actuated mercury piston pump
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Oil well pump
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Automatic means for maintaining a pump piston immersed in lubricating oil
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Fishing line reel
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Machine for producing speed reduction worm gear
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Fish hook clamping tool
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Hydraulic drilling lift and packer therefor
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Diaphragm pump and system
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Hydraulic pump
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Projectile
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Fluid actuated double-acting submersible pump
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Hoist
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Knife sharpener
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