MACOM Technology Solutions is a developer and producer of radio, microwave, and millimeter wave semiconductor devices and components. The company is headquartered in Lowell, Massachusetts, and in 2005 was Lowell's largest private employer. MACOM is certified to the ISO9001 international quality standard and ISO14001 environmental standard. The company has design centers and sales offices in North America, Europe, Asia and Australia. MACOM was founded in the 1950s as Microwave Associates by the engineers Vessarios Chigas, Louis Roberts, Hugh Wainwright and Richard M. Walker. The company was initially a small supplier of magnetrons to the U.S. Army Signal Corps. The name was changed to M/A-COM in 1978 to reflect the company's growing involvement in the telecommunication industry and the merger with DCC, Digital Communications Corporation. In May 1981, MACOM acquired Ohio Scientific. In the 1990s, MACOM was acquired by AMP Inc., which was in turn acquired by Tyco Electronics.