2168569

Information

• Patent Grant
• 2168569

• References
• Source

• Patent Number

  2,168,569

• Date Filed

  Not available

• Date Issued

  Tuesday, August 8, 1939
  85 years ago

• CPC

  • H04R21/026 - in which the sound is perpendicular to the current crossing the transducer material

• US Classifications

  • 381 - Electrical audio signal processing systems and devices