3621249

Information

• Patent Grant
• 3621249

• References
• Source

• Patent Number

  3,621,249

• Date Filed

  Not available

• Date Issued

  Tuesday, November 16, 1971
  54 years ago

• CPC

  • G07C9/00055 - visually
  • G01N21/6447 - by visual observation

• US Classifications

  • 250 - Radiant energy