3664138

Information

• Patent Grant
• 3664138

• References
• Source

• Patent Number

  3,664,138

• Date Filed

  Not available

• Date Issued

  Tuesday, May 23, 1972
  52 years ago

• CPC

  • F15C1/003 - for process regulation, (
  • E21D23/0073 - with advancing shifting devices connected therewith
  • E21D23/26 - Hydraulic or pneumatic control

• US Classifications

  • 405 - Hydraulic and earth engineering