1731134

Information

• Patent Grant
• 1731134

• References
• Source

• Patent Number

  1,731,134

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1929
  95 years ago

• CPC

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

• US Classifications

  • 356 - Optics: measuring and testing
  • 315 - Electric lamp and discharge devices: systems