1662156

Information

• Patent Grant
• 1662156

• References
• Source

• Patent Number

  1,662,156

• Date Filed

  Not available

• Date Issued

  Tuesday, March 13, 1928
  96 years ago

• CPC

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

• US Classifications

  • 356 - Optics: measuring and testing