2140859

Information

• Patent Grant
• 2140859

• References
• Source

• Patent Number

  2,140,859

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1938
  86 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