1939992

Information

• Patent Grant
• 1939992

• References
• Source

• Patent Number

  1,939,992

• Date Filed

  Not available

• Date Issued

  Tuesday, December 19, 1933
  91 years ago

• CPC

  • G11B3/04 - Multiple, convertible, or alternative transducing arrangements

• US Classifications

  • 369 - Dynamic information storage or retrieval