3716921

Information

• Patent Grant
• 3716921

• References
• Source

• Patent Number

  3,716,921

• Date Filed

  Not available

• Date Issued

  Tuesday, February 20, 1973
  53 years ago

• CPC

  • B43L13/208 - letters, numbers, symbols
  • B43L13/004 - Manual lettering devices

• US Classifications

  • 033 - Geometrical instruments