Miscellaneous Antiques - Malone-Lemmon Control-O-Meter
Made by Stephenson Laboratories, New York City. Connections go to a coil, there are 2 other windings that are connected to 2 variable condenser sections (180 degress apart).
winter Vintage Electronics Expo
is on Feb 1, 2020 at the Costick Center, 28600 Eleven Mile Rd, Farmington Hills, MI