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US4651582A
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Counterbalanced pumps
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US4388837A
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Positive engagement fail safe mechanism and lift belt construction for long stroke, well pumping unit
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US4391155A
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Reciprocating drive and reversing mechanism for long stroke, well pumping unit
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US4242057A
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Tandem long stroke reciprocating mud pump assembly
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US3986564A
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Well rig
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US3538777A
|
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Air cushion counterbalance for longstroke well pumping apparatus
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US3483828A
|
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Pumping apparatus for deep wells
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US3529651A
|
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Hip and valley partition
|
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US3345950A
|
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Deep well pumping apparatus
|
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US3271788A
|
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Trackless swimming pool cover
|
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US3271789A
|
|
Swimming pool cover
|
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US3244404A
|
|
Drawworks assembly
|
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US3248958A
|
|
Wire line deep well pumping apparatus
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US3173549A
|
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Material handling device
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US3185508A
|
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Wedge seal coupling
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GB899340A
|
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Swimming pool cover
|
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US3070811A
|
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Flexible swimming pool cover
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US3093251A
|
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Power operated pipe bin
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US3156328A
|
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Combination outrigger and front leg extension
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US3181658A
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Well servicing rig
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