2491794

Information

• Patent Grant
• 2491794

• References
• Source

• Patent Number

  2,491,794

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1949
  75 years ago

• CPC

  • H04R21/04 - Gramophone pick-ups using a stylus Recorders using a stylus

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 073 - Measuring and testing
  • 338 - Electrical resistors