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| Enclosed worm gear pumping unit developed by W. C. Trout. |
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While the company continued to serve East Texas' sawmill industry during the 1920's, under the leadership of W. C. Trout, the company expanded its operations by producing oilfield pumping units, including the Trout counterbalanced unit pioneered at Hull, Texas in 1925. |
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| Since the 1920's, when W.C. Trout invented the counterbalanced pumping unit, Lufkin has sold over 200,000 pumping units to customers worldwide. Today, these pumping units are the dominant equipment to lift oil from reservoirs. |
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