1754180

Information

• Patent Grant
• 1754180

• References
• Source

• Patent Number

  1,754,180

• Date Filed

  Not available

• Date Issued

  Tuesday, April 8, 1930
  94 years ago

• CPC

  • H01J7/42 - Means structurally associated with the tube or lamp for indicating defects or previous use

• US Classifications

  • 324 - Electricity: measuring and testing
  • 313 - Electric lamp and discharge devices