1439072

Information

• Patent Grant
• 1439072

• References
• Source

• Patent Number

  1,439,072

• Date Filed

  Not available

• Date Issued

  Tuesday, December 19, 1922
  102 years ago

• CPC

  • E04D3/351 - at least one of the layers being composed of insulating material
  • E04D3/354 - more than one of the layers being composed of insulating material

• US Classifications

  • 052 - Static structures