3266257

Information

• Patent Grant
• 3266257

• References
• Source

• Patent Number

  3,266,257

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1966
  58 years ago

• CPC

  • E21D9/0621 - Shield advancing devices
  • E21D9/087 - with a rotary drilling-head cutting simultaneously the whole cross-section
  • E21D9/12 - Devices for removing or hauling away excavated material or spoil Working or loading platforms
  • E21D19/00 - Provisional protective covers for working space

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 277 - Seal for a joint or juncture
  • 299 - Mining or in situ disintegration of hard material