3454874

Information

• Patent Grant
• 3454874

• References
• Source

• Patent Number

  3,454,874

• Date Filed

  Not available

• Date Issued

  Tuesday, July 8, 1969
  55 years ago

• CPC

  • H03B5/10 - active element in amplifier being vacuum tube
  • G01B7/105 - for measuring thickness of coating

• US Classifications

  • 324 - Electricity: measuring and testing