3217498

Information

• Patent Grant
• 3217498

• References
• Source

• Patent Number

  3,217,498

• Date Filed

  Not available

• Date Issued

  Tuesday, November 16, 1965
  59 years ago

• CPC

  • E21D23/0069 - without essential advancing shifting devices
  • E21D17/006 - characterised by the material
  • E21D17/0206 - Hydraulically operated extension devices
  • E21D17/086 - or articulated type
  • E21D23/0073 - with advancing shifting devices connected therewith

• US Classifications

  • 405 - Hydraulic and earth engineering