Relay unit BE-84-A (teletype trunk) - USA Voorschrift, Technical Manual, 11-343 Visual signaling Signal Corps United States Army Signal generator TS-343/U - USA Voorschrift, Technical Manual, 11-1233 Pre-induction vocational training in electrical signal communication research paper improved radio sonde and its performance / by Harry Diamond [et al.] Keyers TG-10-A, TG-10-B, TG-10-C, TG-10-D, TG-10-F, TG-10-G, TG-10-H and TG-10-J - USA Voorschrift, Technical Manual, 11-447
