Railway bell signal (type Mantelbude) as manufactured by Siemens & Halske. Several construction variants possible:
- single or double tone device (with one or two bells respectively);
- device with indicator disc.
Based on:
- List, W: Elektromechanische Eisenbahnläutewerke (last access: 4th July 2017);
- Carstens, S.: Signale, vol. 3, MIBA-Verlag, Nuremberg 2009;
- Roszak, T: Dzwonowe urządzenia sygnałowe, Koleje Małe i Duże 1/2002 (9).