2149250

Information

• Patent Grant
• 2149250

• References
• Source

• Patent Number

  2,149,250

• Date Filed

  Not available

• Date Issued

  Tuesday, March 7, 1939
  85 years ago

• CPC

  • G01J1/4219 - specially adapted for enlargers

• US Classifications

  • 356 - Optics: measuring and testing
  • 250 - Radiant energy
  • 355 - Photocopying