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Stewart & Stevenson is one of the leading designers, manufacturers and marketers of specialized equipment and aftermarket parts and services. Its product offerings include well stimulation, drilling, coiled tubing, cementing, nitrogen pumping, power generation and electrical systems, as well as engines, transmissions and material handling equipment. Stewart & Stevenson also offers air compressor and vacuum systems, compressed air-contaminant removal systems, pneumatic air tools, fire apparatus, prime movers and generator controls. In addition, it sells materials handlers, railcar movers, medium-voltage switchgears, hydraulic control systems and torque converters. The company serves the power generation, marine, construction, materials handling, mining, agriculture and transportation industries. Stewart & Stevenson has been operational fro more than 100 years and maintains a location in San Antonio.