3812681

Information

• Patent Grant
• 3812681

• References
• Source

• Patent Number

  3,812,681

• Date Filed

  Not available

• Date Issued

  Tuesday, May 28, 1974
  50 years ago

• CPC

  • E21D23/0052 - with advancing shifting devices connected therewith

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 062 - Refrigeration