1937021

Information

• Patent Grant
• 1937021

• References
• Source

• Patent Number

  1,937,021

• Date Filed

  Not available

• Date Issued

  Tuesday, November 28, 1933
  91 years ago

• CPC

  • G11B11/18 - with reproducing by optical means

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 250 - Radiant energy