2989597

Information

• Patent Grant
• 2989597

• References
• Source

• Patent Number

  2,989,597

• Date Filed

  Not available

• Date Issued

  Tuesday, June 20, 1961
  63 years ago

• CPC

  • H04R25/04 - comprising pocket amplifiers
  • H04R1/08 - Mouthpieces; Microphones; Attachments therefor

• US Classifications

  • 381 - Electrical audio signal processing systems and devices
  • 181 - Acoustics