3681645

Information

• Patent Grant
• 3681645

• References
• Source

• Patent Number

  3,681,645

• Date Filed

  Not available

• Date Issued

  Tuesday, August 1, 1972
  52 years ago

• CPC

  • H01J31/16 - with mask carrying a number of selectively displayable signs

• US Classifications

  • 315 - Electric lamp and discharge devices: systems
  • 313 - Electric lamp and discharge devices