1664818

Information

• Patent Grant
• 1664818

• References
• Source

• Patent Number

  1,664,818

• Date Filed

  Not available

• Date Issued

  Tuesday, April 3, 1928
  96 years ago

• CPC

  • G06G1/0042 - for optics, for photography

• US Classifications

  • 396 - Photography
  • 235 - Registers