1732887

Information

• Patent Grant
• 1732887

• References
• Source

• Patent Number

  1,732,887

• Date Filed

  Not available

• Date Issued

  Tuesday, October 22, 1929
  95 years ago

• CPC

  • E21B7/122 - with submersible vertically movable guide

• US Classifications

  • 175 - Boring or penetrating the earth