2609458

Information

• Patent Grant
• 2609458

• References
• Source

• Patent Number

  2,609,458

• Date Filed

  Not available

• Date Issued

  Tuesday, September 2, 1952
  72 years ago

• CPC

  • H04R21/021 - with granular resistance material

• US Classifications

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