3486074

Information

• Patent Grant
• 3486074

• References
• Source

• Patent Number

  3,486,074

• Date Filed

  Not available

• Date Issued

  Tuesday, December 23, 1969
  55 years ago

• CPC

  • H04Q9/06 - Calling by using amplitude or polarity of dc

• US Classifications

  • 361 - Electricity: electrical systems and devices