An oil well pump jack in northeastern Colorado, showing motion of the pump, the end known as the 'horsehead' (left side), walking beam, crank, and counterweight. A pump jack is also known as a pumpjack, a pumping unit, a grasshopper pump, and a jack pump, among other names.
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Image Number: 4316-3308Rights ManagedCredit Line:Ed Darack/Darack, Ed/SuperStockCollection:Darack, Ed Contributor:Ed Darack Model Release:NoProperty Release:NoResolution:5370×3580