2490340

Information

• Patent Grant
• 2490340

• References
• Source

• Patent Number

  2,490,340

• Date Filed

  Not available

• Date Issued

  Tuesday, December 6, 1949
  75 years ago

• CPC

  • G04C11/002 - by changing the driving speed

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 310 - Electrical generator or motor structure
  • 318 - Electricity: motive power systems
  • 968 - Horology