ARi was established in 1952 as Aero Research Instrument in Chicago, Illinois. High quality MI Cable made in the USA, we are a manufacturer of mineral insulated cable, many of our Thermocouples, RTDs and Heaters are available in bendable sheaths and longer lengths. This in-house capability enables us to manufacture a variety of custom material combinations. based out of 381 ARI COURT, ADDISON, Illinois, United States.