2094158

Information

• Patent Grant
• 2094158

• References
• Source

• Patent Number

  2,094,158

• Date Filed

  Not available

• Date Issued

  Tuesday, September 28, 1937
  86 years ago

• CPC

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

• US Classifications

  • 356 - Optics: measuring and testing