3817621

Information

• Patent Grant
• 3817621

• References
• Source

• Patent Number

  3,817,621

• Date Filed

  Not available

• Date Issued

  Tuesday, June 18, 1974
  50 years ago

• CPC

  • G01C3/12 - with monocular observation at a single point

• US Classifications

  • 356 - Optics: measuring and testing
  • 033 - Geometrical instruments