1804364

Information

• Patent Grant
• 1804364

• References
• Source

• Patent Number

  1,804,364

• Date Filed

  Not available

• Date Issued

  Tuesday, May 5, 1931
  94 years ago

• CPC

  • H04R19/06 - Gramophone pick-ups using a stylus Recorders using a stylus

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 307 - Electrical transmission or interconnection systems