1538256

Information

• Patent Grant
• 1538256

• References
• Source

• Patent Number

  1,538,256

• Date Filed

  Not available

• Date Issued

  Tuesday, May 19, 1925
  99 years ago

• CPC

  • F22D1/04 - the tubes having plain outer surfaces

• US Classifications

  • 122 - Liquid heaters and vaporizers