2808464

Information

• Patent Grant
• 2808464

• References
• Source

• Patent Number

  2,808,464

• Date Filed

  Not available

• Date Issued

  Tuesday, October 1, 1957
  66 years ago

• CPC

  • H04Q5/08 - Signalling by continuous ac

• US Classifications

  • 455 - Telecommunications
  • 379 - Telephonic communications