2697136

Information

• Patent Grant
• 2697136

• References
• Source

• Patent Number

  2,697,136

• Date Filed

  Not available

• Date Issued

  Tuesday, December 14, 1954
  70 years ago

• CPC

  • H04R21/021 - with granular resistance material

• US Classifications

  • 381 - Electrical audio signal processing systems and devices
  • 252 - Compositions