2147397

Information

• Patent Grant
• 2147397

• References
• Source

• Patent Number

  2,147,397

• Date Filed

  Not available

• Date Issued

  Tuesday, February 14, 1939
  85 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
  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets