1372500

Information

• Patent Grant
• 1372500

• References
• Source

• Patent Number

  1,372,500

• Date Filed

  Not available

• Date Issued

  Tuesday, March 22, 1921
  104 years ago

• CPC

  • E21F17/18 - Special adaptations of signalling or alarm devices
  • Y10S200/30 - Fluid conductor
  • Y10S200/31 - Fluid flow

• US Classifications

  • 200 - Electricity: circuit makers and breakers
  • 454 - Ventilation