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Broadwind, Inc. manufactures and sells structures, equipment, and components for clean tech and other specialized applications primarily in the United States. It operates through three segments: Heavy Fabrications, Gearing, and Industrial Solutions. The Heavy Fabrications segment provides fabrications to various industrial markets. It offers steel towers and adapters primarily to wind turbine manufacturers. Its Gearing segment provides gearing, gearboxes, and precision machined components to a range of customers in diverse markets, including surface and underground mining, wind energy, steel, material handling, infrastructure, onshore and offshore oil and gas fracking and drilling, marine, and other industrial markets. This segment also offers heat treat services for aftermarket and original equipment manufacturer applications. The Industrial Solutions segment provides supply chain solutions for offering instrumentation and controls, valve assemblies, sensor devices, fuel system components, electrical junction boxes and wiring, energy storage services, and electromechanical devices; light fabrication, inventory management, and kitting and assembly services; packaging solutions; and supply chain solutions, light fabrication, inventory management, and kitting and assembly services for combined cycle natural gas turbine market. It sells its products to the energy, mining, and infrastructure sectors through its direct sales force and independent sales agents. The company was formerly known as Broadwind Energy, Inc. and changed its name to Broadwind, Inc. in May 2020. Broadwind, Inc. is headquartered in Cicero, Illinois.

ClearSign Technologies Corporation designs and develops technologies to enhance operational performance, energy efficiency, emission reduction, safety, and overall cost-effectiveness of industrial and commercial systems in the United States and the People's Republic of China. Its ClearSign Core Burner Technology consists of an industrial burner body and a downstream porous ceramic structure or metal flame stabilizing device; ClearSign Core Plug & Play Burner technology provides direct burner replacement for traditional refinery process heaters; and ClearSign Eye Flame Sensor, an electrical flame sensor for industrial applications. The company also provides ClearSign Core Boiler Burner; and ClearSign Core Flaring Burners technologies. It serves energy, institutional, commercial and industrial boiler, chemical, and petrochemical industries. The company was formerly known as ClearSign Combustion Corporation and changed its name ClearSign Technologies Corporation in November 2019. ClearSign Technologies Corporation was incorporated in 2008 and is headquartered in Tulsa, Oklahoma.

Chicago Rivet & Machine Co. operates in the fastener industry in North America. It operates in two segments, Fasteners and Assembly Equipment. The Fastener segment manufactures and sells rivets, cold-formed fasteners and parts, and screw machine products. The Assembly Equipment segment engages in the manufacture and sale of automatic rivet setting machines, as well as parts and tools for related machines. The company sells its products to automotive industry through independent sales representatives. Chicago Rivet & Machine Co. was founded in 1920 and is headquartered in Naperville, Illinois.

VAALCO Energy, Inc., an independent energy company, engages in the acquisition, exploration, development, and production of crude oil, natural gas, and natural gas liquids in Gabon, Egypt, Equatorial Guinea, and Canada. The company holds 58.8% interest in the Etame production sharing contract related to the Etame Marin block covering an area of approximately 46,200 gross acres located offshore in the Republic of Gabon in West Africa. It also owns 100% interest in the Eastern Desert, which contains West Gharib, West Bakr and North West Gharib merged concessions covering as area of approximately 45,067 acres, as well as Western Desert, which contains the South Ghazalat concession covering as area of approximately 7,340 acres located in Egypt. In addition, the company production and working interests in Cardium light oil and Mannville liquids-rich gas assets covering as area of 47,400 gross acres located near the north of Calgary, Alberta; and an undeveloped block offshore Equatorial Guinea, West Africa. VAALCO Energy, Inc. was incorporated in 1985 and is headquartered in Houston, Texas.

Fuel Tech, Inc. provides boiler optimization, efficiency improvement, and air pollution reduction and control solutions to utility and industrial customers worldwide. The company operates through Air Pollution Control Technology and FUEL CHEM Technology segments. The Air Pollution Control Technology segment offers technologies to reduce nitrogen oxide (NOx) emissions in flue gas from boilers, incinerators, furnaces, and other stationary combustion sources; NOxOUT and HERT selective non-catalytic reduction systems; selective catalytic reduction systems comprising ammonia injection grid, and graduated straightening grid systems; I-NOx systems; ESP Processes and Services; ULTRA technology; and flue gas conditioning systems. The FUEL CHEM Technology segment provides programs to improve the efficiency, reliability, fuel flexibility, boiler heat rate, and environmental status of combustion units by controlling slagging, fouling, corrosion, opacity, and acid plume, as well as the formation of sulfur trioxide, ammonium bisulfate, particulate matter, sulfur dioxide, and carbon dioxide through the addition of chemicals into the furnace using TIFI targeted in-furnace injection technology. This segment offers its FUEL CHEM program for plants operating in the electric utility, industrial, pulp and paper, waste-to-energy, and university and district heating markets; and the owners of boilers, furnaces, and other combustion units. Fuel Tech, Inc. was incorporated in 1987 and is headquartered in Warrenville, Illinois.