3639061

Information

• Patent Grant
• 3639061

• References
• Source

• Patent Number

  3,639,061

• Date Filed

  Not available

• Date Issued

  Tuesday, February 1, 1972
  53 years ago

• CPC

  • G03D13/008 - Safety systems

• US Classifications

  • 356 - Optics: measuring and testing
  • 250 - Radiant energy
  • 396 - Photography