1974880

Information

• Patent Grant
• 1974880

• References
• Source

• Patent Number

  1,974,880

• Date Filed

  Not available

• Date Issued

  Tuesday, September 25, 1934
  90 years ago

• CPC

  • G01J3/50 - using electric radiation detectors
  • G01J2003/503 - Densitometric colour measurements

• US Classifications

  • 356 - Optics: measuring and testing