3439773

Information

• Patent Grant
• 3439773

• References
• Source

• Patent Number

  3,439,773

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1969
  56 years ago

• CPC

  • G01V1/112 - for use on the surface of the earth
  • Y10S181/401 - Earth

• US Classifications

  • 181 - Acoustics