2747175

Information

• Patent Grant
• 2747175

• References
• Source

• Patent Number

  2,747,175

• Date Filed

  Not available

• Date Issued

  Tuesday, May 22, 1956
  68 years ago

• CPC

  • H04Q1/4423 - using one signalling frequency

• US Classifications

  • 361 - Electricity: electrical systems and devices
  • 340 - Communications: electrical
  • 379 - Telephonic communications