Wall Mounted LB System Telephone
Cvitush & Cо
This device had a microphone and local electric network fed battery and induction calling. Used carbon microphone and Siemens spoon-shaped electromagnetic telephone (hearing device). Designed by RTV, the German Telegraph Authority (Reichs-Telegraphen-Verwaltung). E. Cvitush in 1895. Used at railways and other institutions in Germany at the beginning of the 20th Century.