2689275

Information

• Patent Grant
• 2689275

• References
• Source

• Patent Number

  2,689,275

• Date Filed

  Not available

• Date Issued

  Tuesday, September 14, 1954
  70 years ago

• CPC

  • H04R9/12 - Gramophone pick-ups using a stylus Recorders using a stylus

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets