Hello, I have the following manual for sale: US Army TM 11-281 RADIO SETS SCR-399-A & SCR-499-A. April 17, 1943. "This Technical Manual published by The Hallicrafters Company." The military BC-610 transmitter/prewar Hallicrafters HT-4. This is an original manual, not a copy. $35.00 shipped. Thank you for looking, Bruce WA8TNC