2190000

Information

• Patent Grant
• 2190000

• References
• Source

• Patent Number

  2,190,000

• Date Filed

  Not available

• Date Issued

  Tuesday, February 13, 1940
  84 years ago

• CPC

  • E21C35/1936 - the picks having a square- or rectangular-section shank
  • B27B33/144 - having cutting inserts or exchangeable cutting teeth
  • B28D1/125 - with exchangeable cutter bits or cutter segments

• US Classifications

  • 299 - Mining or in situ disintegration of hard material