1864180

Information

• Patent Grant
• 1864180

• References
• Source

• Patent Number

  1,864,180

• Date Filed

  Not available

• Date Issued

  Tuesday, June 21, 1932
  92 years ago

• CPC

  • G06G1/0042 - for optics, for photography

• US Classifications

  • 235 - Registers
  • 356 - Optics: measuring and testing