2101741

Information

• Patent Grant
• 2101741

• References
• Source

• Patent Number

  2,101,741

• Date Filed

  Not available

• Date Issued

  Tuesday, December 7, 1937
  87 years ago

• CPC

  • G01J3/461 - with colour spinners

• US Classifications

  • 356 - Optics: measuring and testing