1900189

Information

• Patent Grant
• 1900189

• References
• Source

• Patent Number

  1,900,189

• Date Filed

  Not available

• Date Issued

  Tuesday, March 7, 1933
  91 years ago

• CPC

  • E21F13/065 - Scrapers

• US Classifications

  • 414 - Material or article handling
  • 037 - Excavating
  • 299 - Mining or in situ disintegration of hard material