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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.

Crawford United Corporation, together with its subsidiaries, provides specialty industrial products in the United States, Puerto Rico, Mexico, Canada, and internationally. It operates through two segments: Commercial Air Handling Equipment; and Industrial and Transportation Products. The Commercial Air Handling segment designs, manufactures, and installs large-scale commercial, institutional, and industrial custom air handling solutions to health care, education, pharmaceutical, and industrial manufacturing markets under the FactoryBilt and SiteBilt brand names. The Industrial and Transportation Products segment is involved in the manufacture of flexible interlocking metal hoses primarily to heavy-duty truck manufacturers and aftermarket suppliers, as well as to the agricultural, industrial, and petrochemical markets; and distribution of silicone and hydraulic hoses to the agriculture and general industrial markets. It also provides engineering, machining, grinding, welding, brazing, heat treat, and assembly solutions; rubber and plastic marine hose for the recreational boating industry; engineered manufacturing solutions, including CNC machining, anodizing, electro polishing, and laser marking for defense, aerospace, and medical device markets; and hydraulic hoses, air tank assemblies, and related products to manufacturers of firefighting trucks and other emergency vehicles. In addition, the company engages in the supply of highly engineered forgings for the aerospace, industrial gas turbine, medical prosthetics, alternative energy, petrochemical, and defense industries; and developing and commercializing marketing and data analytic technology applications. The company was formerly known as Hickok Incorporated and changed its name to Crawford United Corporation in May 2019. Crawford United Corporation was founded in 1910 and is headquartered in Cleveland, Ohio.

Sypris Solutions, Inc. engages in the provision of truck components, oil and gas pipeline components, and aerospace and defense electronics. It operates through Sypris Technologies and Sypris Electronics segments. The Sypris Technologies segment is involved in selling of forged, machined, welded, and heat-treated steel components primarily for the heavy commercial vehicle and high-pressure energy pipeline applications. The Sypris Electronics segment includes circuit card and full box build manufacturing, high reliability manufacturing, systems assembly and integration, design for manufacturability and design to specification work. The company was founded in 1997 and is headquartered in Louisville, KY.