2990757

Information

• Patent Grant
• 2990757

• References
• Source

• Patent Number

  2,990,757

• Date Filed

  Not available

• Date Issued

  Tuesday, July 4, 1961
  63 years ago

• CPC

  • G03B7/09977 - with a movable light-measuring element

• US Classifications

  • 396 - Photography
  • 356 - Optics: measuring and testing