3681913

Information

• Patent Grant
• 3681913

• References
• Source

• Patent Number

  3,681,913

• Date Filed

  Not available

• Date Issued

  Tuesday, August 8, 1972
  52 years ago

• CPC

  • G04B19/2538 - automatically corrected at the end of months having less than 31 days

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 040 - Card, picture, or sign exhibiting
  • 968 - Horology