3632880

Information

• Patent Grant
• 3632880

• References
• Source

• Patent Number

  3,632,880

• Date Filed

  Not available

• Date Issued

  Tuesday, January 4, 1972
  53 years ago

• CPC

  • G04G13/00 - Producing acoustic time signals
  • H04M3/4876 - Time announcements

• US Classifications

  • 379 - Telephonic communications
  • 368 - Horology: time measuring systems or devices
  • 369 - Dynamic information storage or retrieval
  • 968 - Horology