1921786

Information

• Patent Grant
• 1921786

• References
• Source

• Patent Number

  1,921,786

• Date Filed

  Not available

• Date Issued

  Tuesday, August 8, 1933
  91 years ago

• CPC

  • H01H47/34 - Energising current supplied by magnetic amplifier
  • B61L1/182 - Use of current of indifferent sort or a combination of different current types
  • B61L23/166 - using alternating current
  • H03K19/164 - using ferro-resonant devices

• US Classifications

  • 246 - Railway switches and signals
  • 361 - Electricity: electrical systems and devices