3791042

Information

• Patent Grant
• 3791042

• References
• Source

• Patent Number

  3,791,042

• Date Filed

  Not available

• Date Issued

  Tuesday, February 12, 1974
  50 years ago

• CPC

  • E21B47/02232 - using a pendulum

• US Classifications

  • 340 - Communications: electrical
  • 033 - Geometrical instruments
  • 175 - Boring or penetrating the earth