2589695

Information

• Patent Grant
• 2589695

• References
• Source

• Patent Number

  2,589,695

• Date Filed

  Not available

• Date Issued

  Tuesday, March 18, 1952
  72 years ago

• CPC

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

• US Classifications

  • 434 - Education and demonstration
  • 346 - Recorders