2150567

Information

• Patent Grant
• 2150567

• References
• Source

• Patent Number

  2,150,567

• Date Filed

  Not available

• Date Issued

  Tuesday, March 14, 1939
  85 years ago

• CPC

  • H03G9/10 - for tone control and volume expansion or compression
  • H03G7/02 - having discharge tubes

• US Classifications

  • 330 - Amplifiers