2293139

Information

• Patent Grant
• 2293139

• References
• Source

• Patent Number

  2,293,139

• Date Filed

  Not available

• Date Issued

  Tuesday, August 18, 1942
  82 years ago

• CPC

  • B61L3/221 - using track circuits
  • B61L1/186 - Use of rectified alternating current

• US Classifications

  • 246 - Railway switches and signals