2420252

Information

• Patent Grant
• 2420252

• References
• Source

• Patent Number

  2,420,252

• Date Filed

  Not available

• Date Issued

  Tuesday, May 6, 1947
  77 years ago

• CPC

  • F41G1/027 - with lens
  • G02B27/32 - Fiducial marks and measuring scales within the optical system

• US Classifications

  • 359 - Optical: systems and elements
  • 033 - Geometrical instruments
  • 396 - Photography