A few of their innovations were very futuristic. From 1939 to 1941, they sold radios that were remotely operated by wireless controls, the one-tube "Mystery Control", used on their 13-tube model 116RX-SU (or 39-116).Mahon, p.127. This feature was not offered by any other maker until the 1970s stereo receivers. Philco ranked 57th among United States corporations in the value of World War II military production contracts.Peck, Merton J. & Scherer, Frederic M. The Weapons Acquisition Process: An Economic Analysis (1962) Harvard Business School p.619
