1755332

Information

• Patent Grant
• 1755332

• References
• Source

• Patent Number

  1,755,332

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1930
  94 years ago

• CPC

  • E21C27/18 - by both slitting and planing

• US Classifications

  • 299 - Mining or in situ disintegration of hard material