2028289

Information

• Patent Grant
• 2028289

• References
• Source

• Patent Number

  2,028,289

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1936
  88 years ago

• CPC

  • H04M3/4876 - Time announcements

• US Classifications

  • 381 - Electrical audio signal processing systems and devices
  • 379 - Telephonic communications