2457575

Information

• Patent Grant
• 2457575

• References
• Source

• Patent Number

  2,457,575

• Date Filed

  Not available

• Date Issued

  Tuesday, December 28, 1948
  76 years ago

• CPC

  • H01J31/14 - Magic-eye or analogous tuning indicators

• US Classifications

  • 324 - Electricity: measuring and testing