• Country
• Germany

• Manufacturer / Brand
• Hagenuk (N&K), Hanseatische App.bau-Ges., Neufeldt & Kuhnke, Nordmark

• Year
• 1924

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 2235

• Wave bands
• - without

• Loudspeaker
• - Is a Headphone or Earphone

• from Radiomuseum.org
• Model: Doppelkopfhörer D [gross] - Hagenuk N&K, Hanseatische App.

• Notes
• Several rather similar variants (small differences) and impedances (e.g. 3000 and 4000 Ohms).

• Source of data
• -- Collector info (Sammler) / Radiokatalog Band 1, Ernst Erb

• Mentioned in
• Radio-Umschau (RU, 68) (2408)

• Literature/Schematics (1)
• -- Collector info (Sammler) (Radio News, Mar.1924, p.1205)

• Other Models

• Here you find 178 models, 143 with images and 70 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hagenuk (N&K), Hanseatische App.bau-Ges., Neufeldt & Kuhnke, Nordmark