3891222

Information

• Patent Grant
• 3891222

• References
• Source

• Patent Number

  3,891,222

• Date Filed

  Not available

• Date Issued

  Tuesday, June 24, 1975
  49 years ago

• CPC

  • G11B3/56 - Sharpening

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 451 - Abrading
  • G9B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER