3531876

Information

• Patent Grant
• 3531876

• References
• Source

• Patent Number

  3,531,876

• Date Filed

  Not available

• Date Issued

  Tuesday, October 6, 1970
  54 years ago

• CPC

  • G09B9/305 - by viewing with a camera a small-scale model of the terrain

• US Classifications

  • 434 - Education and demonstration
  • 040 - Card, picture, or sign exhibiting
  • 352 - Optics: motion pictures