632821

Information

• Patent Grant
• 632821

• References
• Source

• Patent Number

  632,821

• Date Filed

  Not available

• Date Issued

  Tuesday, September 12, 1899
  125 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