• Country
• Germany

• Manufacturer / Brand
• Sonar, Technische Gesellschaft mbH; Berlin

• Year
• 1928

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 86029

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Präzisions-Detektor - Sonar, Technische Gesellschaft

• Notes
• Hartgummigehäuse mit Glasfenster.

• Price in first year of sale
• 6.00 RM

• Source of data
• Katalog Prohaska 1928/29 / Radiokatalog Band 2, Ernst Erb

• Author
• Model page created by Bernd P. Kieck. See "Data change" for further contributors.

• Other Models

• Here you find 3 models, 3 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sonar, Technische Gesellschaft mbH; Berlin