308774

Information

• Patent Grant
• 308774

• References
• Source

• Patent Number

  308,774

• Date Filed

  Not available

• Date Issued

  Tuesday, December 2, 1884
  140 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