2174720

Information

• Patent Grant
• 2174720

• References
• Source

• Patent Number

  2,174,720

• Date Filed

  Not available

• Date Issued

  Tuesday, October 3, 1939
  85 years ago

• CPC

  • G11B3/58 - Cleaning record carriers or styli
  • Y10S29/028 - Magnetic recording digest

• US Classifications

  • 428 - Stock material or miscellaneous articles
  • 029 - Metal working
  • 369 - Dynamic information storage or retrieval
  • G9B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER