2467454

Information

• Patent Grant
• 2467454

• References
• Source

• Patent Number

  2,467,454

• Date Filed

  Not available

• Date Issued

  Tuesday, April 19, 1949
  75 years ago

• CPC

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

• US Classifications

  • 318 - Electricity: motive power systems