1656425

Information

• Patent Grant
• 1656425

• References
• Source

• Patent Number

  1,656,425

• Date Filed

  Not available

• Date Issued

  Tuesday, January 17, 1928
  96 years ago

• CPC

  • H04R21/023 - with more than one granular chamber

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 381 - Electrical audio signal processing systems and devices