2217528

Information

• Patent Grant
• 2217528

• References
• Source

• Patent Number

  2,217,528

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1940
  84 years ago

• CPC

  • B61L1/182 - Use of current of indifferent sort or a combination of different current types
  • B61L23/168 - using coded current

• US Classifications

  • 246 - Railway switches and signals