3438637

Information

• Patent Grant
• 3438637

• References
• Source

• Patent Number

  3,438,637

• Date Filed

  Not available

• Date Issued

  Tuesday, April 15, 1969
  55 years ago

• CPC

  • H04R17/06 - comprising two or more styli or transducers

• US Classifications

  • 369 - Dynamic information storage or retrieval