3903615

Information

• Patent Grant
• 3903615

• References
• Source

• Patent Number

  3,903,615

• Date Filed

  Not available

• Date Issued

  Tuesday, September 9, 1975
  49 years ago

• CPC

  • B64F1/20 - Arrangement of optical beacons
  • G02B6/0005 - the light guides being of the fibre type
  • G09B9/305 - by viewing with a camera a small-scale model of the terrain
  • F21W2111/00 - Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in code F21W2101/00

• US Classifications

  • 434 - Education and demonstration
  • 385 - Optical waveguides