1756503

Information

• Patent Grant
• 1756503

• References
• Source

• Patent Number

  1,756,503

• Date Filed

  Not available

• Date Issued

  Tuesday, April 29, 1930
  94 years ago

• CPC

  • E21B25/00 - Apparatus for obtaining or removing undisturbed cores
  • E21B25/12 - of the sliding wedge type

• US Classifications

  • 175 - Boring or penetrating the earth