• Country
• United States of America (USA)

• Manufacturer / Brand
• Martin Copeland Co. (MAR-CO); Providence, RI

• Year
• 1925

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 171354

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: Vernier Dial - Martin Copeland Co. MAR-CO;

• Notes
• MAR-CO Vernier Dial, clockwise or counter-clockwise action.
  Nickel plated : $2.50
  Gold plated : $3.00

• Price in first year of sale
• 3.00 $

• Source of data
• - - Manufacturers Literature

• Literature/Schematics (1)
• Radio Broadcast, Nov. 1925, p. 104

• Author
• Model page created by Karlheinz Gützlaff. See "Data change" for further contributors.

• Other Models

• Here you find 5 models, 4 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Martin Copeland Co. (MAR-CO); Providence, RI