1297260

Information

• Patent Grant
• 1297260

• References
• Source

• Patent Number

  1,297,260

• Date Filed

  Not available

• Date Issued

  Tuesday, March 11, 1919
  106 years ago

• CPC

  • G01J1/28 - using variation of intensity or distance of source

• US Classifications

  • 356 - Optics: measuring and testing