3821880

Information

• Patent Grant
• 3821880

• References
• Source

• Patent Number

  3,821,880

• Date Filed

  Not available

• Date Issued

  Tuesday, July 2, 1974
  50 years ago

• CPC

  • E21D23/26 - Hydraulic or pneumatic control
  • E21D23/0073 - with advancing shifting devices connected therewith
  • Y10T137/87137 - And reciprocating

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 137 - Fluid handling