3420531

Information

• Patent Grant
• 3420531

• References
• Source

• Patent Number

  3,420,531

• Date Filed

  Not available

• Date Issued

  Tuesday, January 7, 1969
  55 years ago

• CPC

  • G11B17/14 - by mechanism in rotating centre post

• US Classifications

  • 369 - Dynamic information storage or retrieval