1688489

Information

• Patent Grant
• 1688489

• References
• Source

• Patent Number

  1,688,489

• Date Filed

  Not available

• Date Issued

  Tuesday, October 23, 1928
  96 years ago

• CPC

  • H01J19/70 - Means for obtaining or maintaining the vacuum
  • H01J1/18 - Supports Vibration-damping arrangements

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 417 - Pumps