3764985

Information

• Patent Grant
• 3764985

• References
• Source

• Patent Number

  3,764,985

• Date Filed

  Not available

• Date Issued

  Tuesday, October 9, 1973
  51 years ago

• CPC

  • B61L3/20 - employing different frequences or coded pulse groups

• US Classifications

  • 340 - Communications: electrical
  • 180 - Motor vehicles
  • 246 - Railway switches and signals