3715879

Information

• Patent Grant
• 3715879

• References
• Source

• Patent Number

  3,715,879

• Date Filed

  Not available

• Date Issued

  Tuesday, February 13, 1973
  52 years ago

• CPC

  • G04B23/10 - with pre-signal with repeated signal with changeable intensity of sound

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 968 - Horology