1384513

Information

• Patent Grant
• 1384513

• References
• Source

• Patent Number

  1,384,513

• Date Filed

  Not available

• Date Issued

  Tuesday, July 12, 1921
  103 years ago

• CPC

  • G01J3/461 - with colour spinners

• US Classifications

  • 356 - Optics: measuring and testing