3235977

Information

• Patent Grant
• 3235977

• References
• Source

• Patent Number

  3,235,977

• Date Filed

  Not available

• Date Issued

  Tuesday, February 22, 1966
  58 years ago

• CPC

  • G09B1/14 - the elements being slidably mounted on the support

• US Classifications

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