2493511

Information

• Patent Grant
• 2493511

• References
• Source

• Patent Number

  2,493,511

• Date Filed

  Not available

• Date Issued

  Tuesday, January 3, 1950
  75 years ago

• CPC

  • G11B3/72 - Groove formations

• US Classifications

  • 033 - Geometrical instruments
  • 369 - Dynamic information storage or retrieval