1903384

Information

• Patent Grant
• 1903384

• References
• Source

• Patent Number

  1,903,384

• Date Filed

  Not available

• Date Issued

  Tuesday, April 4, 1933
  91 years ago

• CPC

  • E21F1/12 - Devices for automatically opening air doors
  • E21F1/10 - Air doors

• US Classifications

  • 246 - Railway switches and signals