2321581

Information

• Patent Grant
• 2321581

• References
• Source

• Patent Number

  2,321,581

• Date Filed

  Not available

• Date Issued

  Tuesday, June 15, 1943
  81 years ago

• CPC

  • G01P3/04 - by comparing two speeds

• US Classifications

  • 340 - Communications: electrical
  • 315 - Electric lamp and discharge devices: systems
  • 324 - Electricity: measuring and testing