Frequency Electronics Inc. (FEI) is a US company that specializes in the manufacturing of time and frequency devices. It was founded in 1961 by Martin Bloch and is headquartered in New York. FEI's history begins in the 1950s when Martin Bloch started producing quartz resonators for the aviation industry. The company quickly grew and expanded its product range to include other time and frequency devices. In the 1960s and 1970s, FEI expanded into the satellite navigation sector and began producing atomic clocks for use in GPS systems. FEI offers a wide range of products, from highly precise quartz resonators and oscillators to time and frequency synchronization systems. These products are used in various applications, including satellite communications, aerospace, defense and security, telecommunications, medical devices, and industrial automation. FEI operates three main business divisions: FEI-NY, FEI-Zyfer, and FEI-Elcom. FEI-NY focuses on the development and manufacturing of quartz resonators, oscillators, and frequency generators for the military and civilian markets. FEI-Zyfer specializes in time and frequency synchronization systems for military and civilian applications. FEI-Elcom produces electronic systems for the defense and security industry. An example of an FEI product is the Ultra-Low Noise Oscillator, designed for use in demanding applications such as atomic clock development and satellite communications. This oscillator offers remarkably low phase noise performance and is designed to operate in extreme temperature conditions. Over the years, FEI has earned a reputation for high quality and technological innovation. The company has received numerous awards for its products and services and is a preferred supplier for many leading companies in the aerospace industry. FEI is an example of a company that focuses on a highly specialized niche and is a leader in that field. The company has demonstrated its ability to adapt to new technologies and changes in the markets it operates in and has a successful history of innovation and growth.