1880090

Information

• Patent Grant
• 1880090

• References
• Source

• Patent Number

  1,880,090

• Date Filed

  Not available

• Date Issued

  Tuesday, September 27, 1932
  92 years ago

• CPC

  • E21D15/586 - the props being pre-loaded
  • E21C29/02 - by means on the machine exerting a thrust against fixed supports

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 254 - Implements or apparatus for applying pushing or pulling force