1622229

Information

• Patent Grant
• 1622229

• References
• Source

• Patent Number

  1,622,229

• Date Filed

  Not available

• Date Issued

  Tuesday, March 22, 1927
  98 years ago

• CPC

  • B43L13/16 - free-hand

• US Classifications

  • 033 - Geometrical instruments
  • 434 - Education and demonstration