1902420

Information

• Patent Grant
• 1902420

• References
• Source

• Patent Number

  1,902,420

• Date Filed

  Not available

• Date Issued

  Tuesday, March 21, 1933
  92 years ago

• CPC

  • E21C35/1936 - the picks having a square- or rectangular-section shank
  • Y10T279/17846 - Single transverse bolt

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 279 - Chucks or sockets