2629184

Information

• Patent Grant
• 2629184

• References
• Source

• Patent Number

  2,629,184

• Date Filed

  Not available

• Date Issued

  Tuesday, February 24, 1953
  72 years ago

• CPC

  • G09B1/28 - the elements being slidable

• US Classifications

  • 434 - Education and demonstration
  • 116 - Signals and indicators
  • 281 - Books, strips, and leaves