• Country
• United States of America (USA)

• Manufacturer / Brand
• DeWald Radio Mfg. Corp., Pierce Airo Inc.

• Year
• 1937 ??

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 37423

• • Brand: Pierce Airo

• Wave bands
• - without

• Loudspeaker
• Magnetic loudspeaker (reed) generic.

• from Radiomuseum.org
• Model: 200 Electrocall System - DeWald Radio Mfg. Corp.,

• Notes
• Intercom. system. Consists of either two remote stations 200A only, or of a Master station (202M) plus up to six Remote stations (200A or 202A or 203A).

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 8 = 1937 and before

• Other Models

• Here you find 443 models, 195 with images and 344 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from DeWald Radio Mfg. Corp., Pierce Airo Inc.