2147288

Information

• Patent Grant
• 2147288

• References
• Source

• Patent Number

  2,147,288

• Date Filed

  Not available

• Date Issued

  Tuesday, February 14, 1939
  85 years ago

• CPC

  • F04B39/068 - prevention of freezing

• US Classifications

  • 138 - Pipes and tubular conduits