2255797

Information

• Patent Grant
• 2255797

• References
• Source

• Patent Number

  2,255,797

• Date Filed

  Not available

• Date Issued

  Tuesday, September 16, 1941
  82 years ago

• CPC

  • B61L3/20 - employing different frequences or coded pulse groups
  • B61L13/002 - actuated by the passage of the vehicle

• US Classifications

  • 246 - Railway switches and signals