3426649

Information

• Patent Grant
• 3426649

• References
• Source

• Patent Number

  3,426,649

• Date Filed

  Not available

• Date Issued

  Tuesday, February 11, 1969
  55 years ago

• CPC

  • E21D23/0069 - without essential advancing shifting devices
  • E21D15/44 - Hydraulic, pneumatic, or hydraulic-pneumatic props
  • F15B15/16 - of the telescopic type

• US Classifications

  • 091 - Motors: expansible chamber type
  • 092 - Expansible chamber devices