2111589

Information

• Patent Grant
• 2111589

• References
• Source

• Patent Number

  2,111,589

• Date Filed

  Not available

• Date Issued

  Tuesday, March 22, 1938
  86 years ago

• CPC

  • H03G9/10 - for tone control and volume expansion or compression

• US Classifications

  • 330 - Amplifiers
  • 329 - Demodulators
  • 455 - Telecommunications