1452340

Information

• Patent Grant
• 1452340

• References
• Source

• Patent Number

  1,452,340

• Date Filed

  Not available

• Date Issued

  Tuesday, April 17, 1923
  101 years ago

• CPC

  • G09B1/40 - to form symbols or signs by appropriate arrangement

• US Classifications

  • 434 - Education and demonstration