ESCO Technologies Inc. provides engineered filtration and fluid control products, and integrated propulsion systems worldwide. It operates through three segments: Aerospace & Defense (A&D), Utility Solutions Group (USG), and RF Test & Measurement (Test). The A&D segment designs and manufactures specialty filtration products, including hydraulic filter elements and fluid control devices used in commercial aerospace applications; filter mechanisms used in micro-propulsion devices for satellites; and custom designed filters for manned aircraft and submarines. This segment also designs, develops, and manufactures elastomeric-based signature reduction solutions for U.S. naval vessels; and mission-critical bushings, pins, sleeves, and precision-tolerance machined components for landing gear, rotor heads, engine mounts, flight controls, and actuation systems for the aerospace and defense industries. The USG segment offers diagnostic testing solutions that enable electric power grid operators to assess the integrity of high-voltage power delivery equipment; and decision support tools for the renewable energy industry comprising wind and solar. The Test segment provides products and systems to measure and control RF and acoustic energy for research and development, regulatory compliance, and medical and security applications; and provides turnkey systems, including RF test facilities and measurement systems, acoustic test enclosures, RF and magnetically shielded rooms, and secure communication facilities. This segment also supplies RF absorptive materials, filters, antennas, field probes, test cells, proprietary measurement software, and other test accessories; and offers calibration and product tests, as well as feedthrough capacitors, high current power, telephone, data and control line filters, and a range of high-altitude electromagnetic protection filters. The company distributes its products through a network of distributors, sales representatives, direct sales teams, and in-house sales personnel. ESCO Technologies Inc. was incorporated in 1990 and is based in Saint Louis, Missouri.