880074

Information

• Patent Grant
• 880074

• References
• Source

• Patent Number

  880,074

• Date Filed

  Not available

• Date Issued

  Tuesday, February 25, 1908
  117 years ago

• CPC

  • G01K7/40 - using ionisation of gases

• US Classifications

  • 374 - Thermal measuring and testing
  • 340 - Communications: electrical