320142

Information

• Patent Grant
• 320142

• References
• Source

• Patent Number

  320,142

• Date Filed

  Not available

• Date Issued

  Tuesday, June 16, 1885
  139 years ago

• CPC

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

• US Classifications

  • 434 - Education and demonstration
  • 206 - Special receptacle or package
  • 211 - Supports: racks