3826557

Information

• Patent Grant
• 3826557

• References
• Source

• Patent Number

  3,826,557

• Date Filed

  Not available

• Date Issued

  Tuesday, July 30, 1974
  50 years ago

• CPC

  • G09B9/305 - by viewing with a camera a small-scale model of the terrain
  • G02B26/04 - by periodically varying the intensity of light

• US Classifications

  • 359 - Optical: systems and elements