1520357

Information

• Patent Grant
• 1520357

• References
• Source

• Patent Number

  1,520,357

• Date Filed

  Not available

• Date Issued

  Tuesday, December 23, 1924
  100 years ago

• CPC

  • H04R7/00 - Diaphragms for electromechanical transducers Cones
  • G11B3/50 - Anvils or other supports opposing stylus forces
  • H04R17/04 - Gramophone pick-ups using a stylus Recorders using a stylus

• US Classifications

  • 369 - Dynamic information storage or retrieval