2233769

Information

• Patent Grant
• 2233769

• References
• Source

• Patent Number

  2,233,769

• Date Filed

  Not available

• Date Issued

  Tuesday, March 4, 1941
  83 years ago

• CPC

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

• US Classifications

  • 455 - Telecommunications
  • 329 - Demodulators