2997548

Information

• Patent Grant
• 2997548

• References
• Source

• Patent Number

  2,997,548

• Date Filed

  Not available

• Date Issued

  Tuesday, August 22, 1961
  63 years ago

• CPC

  • H04R17/08 - signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously
  • H04R17/06 - comprising two or more styli or transducers

• US Classifications

  • 369 - Dynamic information storage or retrieval