2729813

Information

• Patent Grant
• 2729813

• References
• Source

• Patent Number

  2,729,813

• Date Filed

  Not available

• Date Issued

  Tuesday, January 3, 1956
  69 years ago

• CPC

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

• US Classifications

  • 341 - Coded data generation or conversion
  • 340 - Communications: electrical