• Country
• United States of America (USA)

• Manufacturer / Brand
• Polo Engineering Laboratories; New York, NY

• Year
• 1930 ??

• Category
• Pre-stage (adaptor for SW/FM/VHF/UHF incl. built-in), Frequency converter

• Radiomuseum.org ID
• 52163

• from Radiomuseum.org
• Model: Converter 1ASW - Polo Engineering Laboratories;

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Other Models

• Here you find 4 models, 3 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Polo Engineering Laboratories; New York, NY