Soviet Union Russian antique TELEPHONE Directory KD-6 BAKELITE ORIGIN USSR. A unique old-regime telephone apparatus of the commanding director of the USSR of the era of developed socialism. The director’s telephone concentrator KD-6. The director’s concentrator (KD-6) is a telephone system of the CB system and is intended for connection to two-wire lines of ordinary subscriber sets of several (up to 6) stations of the RTS CB or ATS of any systems. Allows connection to up to six city or local telephone lines. Provides the ability to hold a line and connect callers to each other (conference call). Weight of the device is 4 kg. Overall dimensions (mm) 315? 192? 162. I do not know how this works. I did not check. After receiving the goods. If you have any questions or need more information about the subject, do not hesitate to contact me. Thank you very much for taking the time to come.