2323676

Information

• Patent Grant
• 2323676

• References
• Source

• Patent Number

  2,323,676

• Date Filed

  Not available

• Date Issued

  Tuesday, July 6, 1943
  81 years ago

• CPC

  • G01J1/14 - using comparison with a surface of graded brightness

• US Classifications

  • 356 - Optics: measuring and testing
  • 235 - Registers