1461568

Information

• Patent Grant
• 1461568

• References
• Source

• Patent Number

  1,461,568

• Date Filed

  Not available

• Date Issued

  Tuesday, July 10, 1923
  101 years ago

• CPC

  • H04L15/285 - Telegraph sounders; Apparatus for acoustic reception

• US Classifications

  • 178 - Telegraphy
  • 340 - Communications: electrical