3819933

Information

• Patent Grant
• 3819933

• References
• Source

• Patent Number

  3,819,933

• Date Filed

  Not available

• Date Issued

  Tuesday, June 25, 1974
  50 years ago

• CPC

  • B61L1/185 - Use of direct current

• US Classifications

  • 246 - Railway switches and signals
  • 331 - Oscillators