2109236

Information

• Patent Grant
• 2109236

• References
• Source

• Patent Number

  2,109,236

• Date Filed

  Not available

• Date Issued

  Tuesday, February 22, 1938
  87 years ago

• CPC

  • E21F3/00 - Cooling or drying of air

• US Classifications

  • 454 - Ventilation
  • 299 - Mining or in situ disintegration of hard material