3103559

Information

• Patent Grant
• 3103559

• References
• Source

• Patent Number

  3,103,559

• Date Filed

  Not available

• Date Issued

  Tuesday, September 10, 1963
  61 years ago

• CPC

  • H04B11/00 - Transmission systems employing sonic, ultrasonic or infrasonic waves
  • H04M1/05 - adapted for use on head, throat, or breast
  • H04R21/021 - with granular resistance material

• US Classifications

  • 381 - Electrical audio signal processing systems and devices