• Country
• United States of America (USA)

• Manufacturer / Brand
• Atwater Kent Mfg. Co.; Philadelphia, USA

• Year
• 1922

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 74553

• Material
• Various materials

• from Radiomuseum.org
• Model: 3509 AF-Transformer - Atwater Kent Mfg. Co.;

• Notes
• Unit for breadboards; 9:1 ratio;

• Price in first year of sale
• 6.00 $

• Source of data
• A.Atwater Kent, The Man, 2002

• Author
• Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.

• Other Models

• Here you find 507 models, 330 with images and 332 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Atwater Kent Mfg. Co.; Philadelphia, USA