1858021

Information

• Patent Grant
• 1858021

• References
• Source

• Patent Number

  1,858,021

• Date Filed

  Not available

• Date Issued

  Tuesday, May 10, 1932
  92 years ago

• CPC

  • E21D15/581 - in which the props are pre- loaded

• US Classifications

  • 254 - Implements or apparatus for applying pushing or pulling force
  • 248 - Supports