3422547

Information

• Patent Grant
• 3422547

• References
• Source

• Patent Number

  3,422,547

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1969
  56 years ago

• CPC

  • G09B1/24 - the elements being in flexible strip form
  • G09B3/04 - of chart form

• US Classifications

  • 434 - Education and demonstration
  • 033 - Geometrical instruments
  • 040 - Card, picture, or sign exhibiting