2663093

Information

• Patent Grant
• 2663093

• References
• Source

• Patent Number

  2,663,093

• Date Filed

  Not available

• Date Issued

  Tuesday, December 22, 1953
  71 years ago

• CPC

  • G06G1/10 - characterised by the graduation

• US Classifications

  • 434 - Education and demonstration
  • D19 - Office supplies