1659923

Information

• Patent Grant
• 1659923

• References
• Source

• Patent Number

  1,659,923

• Date Filed

  Not available

• Date Issued

  Tuesday, February 21, 1928
  97 years ago

• CPC

  • E21C29/20 - with safety devices operating in the event of breakage of the cable or chain

• US Classifications

  • 299 - Mining or in situ disintegration of hard material