1346088

Information

• Patent Grant
• 1346088

• References
• Source

• Patent Number

  1,346,088

• Date Filed

  Not available

• Date Issued

  Tuesday, July 6, 1920
  104 years ago

• CPC

  • G01J1/40 - using limit or visibility or extinction effect

• US Classifications

  • 356 - Optics: measuring and testing