2939054

Information

• Patent Grant
• 2939054

• References
• Source

• Patent Number

  2,939,054

• Date Filed

  Not available

• Date Issued

  Tuesday, May 31, 1960
  64 years ago

• CPC

  • H04Q9/08 - Calling by using continuous ac
  • Y10T307/944 - Power circuit controlled

• US Classifications

  • 361 - Electricity: electrical systems and devices
  • 307 - Electrical transmission or interconnection systems
  • 340 - Communications: electrical