2493673

Information

• Patent Grant
• 2493673

• References
• Source

• Patent Number

  2,493,673

• Date Filed

  Not available

• Date Issued

  Tuesday, January 3, 1950
  75 years ago

• CPC

  • G01J1/22 - using a variable element in the light-path
  • G01J1/126 - for enlarging apparatus

• US Classifications

  • 356 - Optics: measuring and testing