712346

Information

• Patent Grant
• 712346

• References
• Source

• Patent Number

  712,346

• Date Filed

  Not available

• Date Issued

  Tuesday, October 28, 1902
  122 years ago

• CPC

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

• US Classifications

  • 356 - Optics: measuring and testing