08 successive tone unit; sales codes: 171 / 176; sales codes: j74 / J75 / 475

50521; 2 REVOLVING BEAM SIGNAL LAMPS 24 V; Compatible subgroups: 19115/50433; Modifications: 536 - 548/550 - 559/730 - 737/784 - 787/811/812/841 - 843