2999901

Information

• Patent Grant
• 2999901

• References
• Source

• Patent Number

  2,999,901

• Date Filed

  Not available

• Date Issued

  Tuesday, September 12, 1961
  64 years ago

• CPC

  • H04Q5/06 - Signalling by amplitude or polarity of dc
  • H04Q3/00 - Selecting arrangements

• US Classifications

  • 379 - Telephonic communications