1406428

Information

• Patent Grant
• 1406428

• References
• Source

• Patent Number

  1,406,428

• Date Filed

  Not available

• Date Issued

  Tuesday, February 14, 1922
  102 years ago

• CPC

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

• US Classifications

  • 178 - Telegraphy