1393741

Information

• Patent Grant
• 1393741

• References
• Source

• Patent Number

  1,393,741

• Date Filed

  Not available

• Date Issued

  Tuesday, October 18, 1921
  103 years ago

• CPC

  • F22B9/12 - the fire tubes being in substantially horizontal arrangement
  • Y10S122/16 - Welding

• US Classifications

  • 122 - Liquid heaters and vaporizers