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Espey Mfg. & Electronics Corp., a power electronics design and original equipment manufacturing company, designs, manufactures, and tests electronic equipment primarily for use in military and industrial applications in the United States and internationally. The company's principal products include power supplies, power converters, filters, power transformers, magnetic components, power distribution equipment, UPS systems, antennas, and high-power radar systems for use in AC and DC locomotives, shipboard power, shipboard radar, airborne power, ground-based radar, and ground mobile power applications. It also provides various services comprising design and development to specification, build to print, design services, design studies, environmental testing services, metal fabrication, painting services, and development of automatic testing equipment. In addition, the company produces individual components, such as inductors, as well as paints, wires, qualifies, and test items; populates printed circuit boards; and fabricates metalwork. It serves industrial manufacturers and defense companies, the government of the United States, foreign governments, and foreign electronic equipment companies through its direct sales organization and outside sales representatives. Espey Mfg. & Electronics Corp. was incorporated in 1928 and is based in Saratoga Springs, New York.

NOVONIX Limited provides battery materials and development technology for battery manufacturers, materials companies, automotive original equipment manufacturers (OEMs), and consumer electronics manufacturers in North America, Asia, Australia, and Europe. It operates through Battery Materials and Battery Technology segments. The Battery Materials segment develops and manufactures battery anode materials. The Battery Technology segment develops battery cell testing equipment, performs consulting services, and carries out research and development in battery development. The company is involved in the investment and real estate borrowing activities; and offers battery technology, battery testing hardware equipment, and battery testing and development consulting services. The company was formerly known as Graphitecorp Limited and changed its name to NOVONIX Limited in July 2017. NOVONIX Limited was incorporated in 2012 and is based in Brisbane, Australia.

NexOptic Technology Corp., a technology company, develops artificial intelligence and imaging products. It engages in developing All Light Intelligent Imaging Solutions (ALIIS), a suite of intelligent imaging solution that processes raw images and video in real time; and NexCompress technological solutions. The company was formerly known as Elissa Resources Ltd. and changed its name to NexOptic Technology Corp. in February 2016. NexOptic Technology Corp. was incorporated in 2007 and is headquartered in Vancouver, Canada.

The SPDR S&P Aerospace & Defense ETF (XAR) is an exchange-traded fund that mostly invests in industrials equity. The fund tracks an equal-weighted index of US aerospace & defense companies. XAR was launched on Sep 28, 2011 and is managed by State Street.