WECo 509W Headphones 1918 patent
By Clint Gilliland, ; posted March 1, 2009; hits 2476
 |
| This is a radio type headphone. The receivers are WECo 509W, patented July 23, 1918. Coil resistance 1100 ohms, The receivers are good but the cord is open in at least two places. The tips were removed and lugs crimped on. |