1628077

Information

• Patent Grant
• 1628077

• References
• Source

• Patent Number

  1,628,077

• Date Filed

  Not available

• Date Issued

  Tuesday, May 10, 1927
  97 years ago

• CPC

  • H04L27/26 - Systems using multi-frequency codes
  • Y10S200/20 - Sound and vibration operated

• US Classifications

  • 178 - Telegraphy
  • 200 - Electricity: circuit makers and breakers