2247085

Information

• Patent Grant
• 2247085

• References
• Source

• Patent Number

  2,247,085

• Date Filed

  Not available

• Date Issued

  Tuesday, June 24, 1941
  83 years ago

• CPC

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

• US Classifications

  • 330 - Amplifiers
  • 455 - Telecommunications