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CARBO Ceramics Inc., a technology company, provides products and services to the oil and gas, industrial, and environmental markets worldwide. It operates through two segments, Oilfield and Industrial Technologies and Services, and Environmental Technologies and Services. The Oilfield and Industrial Technologies and Services segment manufactures and sells oilfield ceramic technology products, base ceramic proppants, and frac sand proppants to pressure pumping companies, and oil and gas operators for use in the hydraulic fracturing of natural gas and oil wells. It also provides technology to design, build, and optimize the Frac; sells fracture stimulation software under the FracPro brand; and offers fracture design and consulting services to oil and natural gas exploration and production companies under the StrataGen brand name. The Environmental Technologies and Services segment provides spill prevention, containment, and countermeasure systems for the oil and gas industry. CARBO Ceramics Inc. was founded in 1987 and is headquartered in Houston, Texas.

InPlay Oil Corp. engages in the acquisition, exploration, development, and production of petroleum and natural gas properties in Canada. The company produces and sells crude oil, natural gas, and natural gas liquids. It focuses on light oil asset base located in West Central, Alberta. InPlay Oil Corp. is headquartered in Calgary, Canada.

Recon Technology, Ltd. provides hardware, software, and on-site services to companies in the petroleum mining and extraction industry in the People's Republic of China. The company offers equipment, tools, and other components and parts related to oilfield production and other energy industries; and develops and sells industrial automation control and information solutions. It also provides equipment for oil and gas production and transportation, including heating furnaces and burner, as well as improvement techniques comprising packers of fracturing; production packers; sand prevention in oil and water wells; water locating and plugging techniques; fissure shaper; fracture acidizing techniques; and electronic broken-down services to resolve block-up and freezing problems. In addition, the company offers automation systems and services, including pumping unit controller that monitors the pumping units and collects data; RTU to monitor natural gas wells and collect gas well pressure data; wireless dynamometers and wireless pressure gauges; electric multi-way valves for oilfield metering station flow control; and natural gas flow computer systems. Further, it provides Recon SCADA oilfield monitor and data acquisition system for supervision and data collection; EPC service of pipeline SCADA system for pipeline monitoring and data acquisition; EPC service of oil and gas wells SCADA system for monitoring and data acquisition of oil wells and natural gas wells; EPC service of oilfield video surveillance and control system to control the oil and gas wellhead and measurement station areas; and technique service for digital oilfield transformation. Additionally, the company offers oilfield waste water treatment solutions and related chemicals; oily sludge disposal solutions; and gas station operation and management solution. Recon Technology, Ltd. was incorporated in 2007 and is headquartered in Beijing, the People's Republic of China.

U.S. Energy Corp., an independent energy company, focuses on the acquisition, exploration, and development of oil and natural gas properties in the United States. It holds interests in various oil and gas properties located in the Rockies region, including Montana, Wyoming, and North Dakota; the Mid-Continent region comprising Oklahoma, Kansas, and North and East Texas; West Texas; South Texas; and the Gulf Coast regions. The company was incorporated in 1966 and is headquartered in Houston, Texas.