3818612

Information

• Patent Grant
• 3818612

• References
• Source

• Patent Number

  3,818,612

• Date Filed

  Not available

• Date Issued

  Tuesday, June 25, 1974
  50 years ago

• CPC

  • G09B9/305 - by viewing with a camera a small-scale model of the terrain
  • G09B9/46 - the aircraft being a helicopter

• US Classifications

  • 434 - Education and demonstration