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AER Energy Resources, Inc., through its subsidiaries, engages in acquiring, managing, and operating oil and gas properties in North America. The company is also involved in the recycling of used motor oil; marketing of related fuel and energy products to users, suppliers, and recycler's; and real estate business. AER Energy Resources, Inc. was founded in 1989 and is based in Scottsdale, Arizona.

Axion Power International, Inc. focuses on PbC battery technology business. It offers hybrid asymmetric energy storage devices. The company was founded in 2003 and is based in Boardman, Ohio.

Environmental Tectonics Corporation, together with its subsidiaries, operates as an engineered solutions company in the United States and internationally. It operates in two segments, Aerospace Solutions (Aerospace) and Commercial/Industrial Systems (CIS). The Aerospace segment engages in the design, manufacture, and sale of aircrew training systems to commercial, governmental, and military defense agencies; training devices, including altitude and multiplace chambers to governmental and military defense agencies, and civil aviation organizations; and advanced disaster management simulators to governmental organizations, original equipment manufacturers, fire and emergency training schools, universities, and airports, as well as provides integrated logistics support services. The CIS segment is involved in the design, manufacture, and sale of steam and gas sterilizers to medical device and pharmaceutical manufacturers, as well as universities; and environmental testing and simulation systems primarily to commercial automotive, as well as to heating, ventilation, and air conditioning manufacturers. This segment also provides parts, as well as upgrade, maintenance, and repair services. The company markets its products through independent sales representatives and distributors. Environmental Tectonics Corporation was incorporated in 1969 and is headquartered in Southampton, Pennsylvania.

Isomet Corporation designs, develops, manufactures, and sells acousto-optic (AO) devices, RF electronics, and optical sub-systems in the United States and internationally. The company offers AO navigation products, including modulators, frequency shifters, deflectors, tunable filters, Q-switches, special function devices, fiber optic couplers, and standard AR coatings; and electronics navigation products, such as modulator drivers, deflector drivers, AOTF drivers, Q-switch drivers, frequency sources and amplifiers, and custom electronics, as well as accessories. Isomet Corporation was founded in 1956 and is based in Springfield, Virginia.