3670438

Information

• Patent Grant
• 3670438

• References
• Source

• Patent Number

  3,670,438

• Date Filed

  Not available

• Date Issued

  Tuesday, June 20, 1972
  52 years ago

• CPC

  • G09F21/04 - by land vehicles
  • Y10S359/903 - with magnet

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • 116 - Signals and indicators
  • 359 - Optical: systems and elements