3855808

Information

• Patent Grant
• 3855808

• References
• Source

• Patent Number

  3,855,808

• Date Filed

  Not available

• Date Issued

  Tuesday, December 24, 1974
  50 years ago

• CPC

  • E21D23/0052 - with advancing shifting devices connected therewith

• US Classifications

  • 405 - Hydraulic and earth engineering