3668858

Information

• Patent Grant
• 3668858

• References
• Source

• Patent Number

  3,668,858

• Date Filed

  Not available

• Date Issued

  Tuesday, June 13, 1972
  52 years ago

• CPC

  • G04B45/04 - Time pieces with invisible drive
  • G04B19/02 - Back-gearing arrangements between gear train and hands

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 475 - Planetary gear transmission systems or components
  • 968 - Horology