2558638

Information

• Patent Grant
• 2558638

• References
• Source

• Patent Number

  2,558,638

• Date Filed

  Not available

• Date Issued

  Tuesday, June 26, 1951
  73 years ago

• CPC

  • B61L1/182 - Use of current of indifferent sort or a combination of different current types

• US Classifications

  • 246 - Railway switches and signals