693388

Information

• Patent Grant
• 693388

• References
• Source

• Patent Number

  693,388

• Date Filed

  Not available

• Date Issued

  Tuesday, February 18, 1902
  123 years ago

• CPC

  • G09B1/32 - comprising elements to be used without a special support
  • B43L1/02 - Slates

• US Classifications

  • 434 - Education and demonstration
  • 033 - Geometrical instruments