3686851

Information

• Patent Grant
• 3686851

• References
• Source

• Patent Number

  3,686,851

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1972
  52 years ago

• CPC

  • G04C21/14 - Electro-acoustic time announcement

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 360 - Dynamic magnetic information storage or retrieval
  • 968 - Horology