2715719

Information

• Patent Grant
• 2715719

• References
• Source

• Patent Number

  2,715,719

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1955
  69 years ago

• CPC

  • B61L25/04 - Indicating or recording train identities
  • H04Q9/06 - Calling by using amplitude or polarity of dc

• US Classifications

  • 340 - Communications: electrical