2637557

Information

• Patent Grant
• 2637557

• References
• Source

• Patent Number

  2,637,557

• Date Filed

  Not available

• Date Issued

  Tuesday, May 5, 1953
  71 years ago

• CPC

  • G11B13/06 - optically and by styli

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 116 - Signals and indicators
  • 362 - Illumination