• Country
• United States of America (USA)

• Manufacturer / Brand
• Penberthy Injector Co.; Detroit, Michigan

• Year
• 1924

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 220577

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• Magnetic loudspeaker (reed) of high quality (4 magnet poles).

• Material
• Various materials

• from Radiomuseum.org
• Model: 4-Pole Phone - Penberthy Injector Co.;

• Notes
• 4-Pole Phone.

• Mentioned in
• Radio Broadcast, Jan. 1924, p. 264

• Author
• Model page created by Hans-Joachim Korn † 16.11.15. See "Data change" for further contributors.

• Other Models

• Here you find 3 models, 3 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Penberthy Injector Co.; Detroit, Michigan