3671657

Information

• Patent Grant
• 3671657

• References
• Source

• Patent Number

  3,671,657

• Date Filed

  Not available

• Date Issued

  Tuesday, June 20, 1972
  52 years ago

• CPC

  • G01S7/52004 - Means for monitoring or calibrating
  • G09B9/56 - Simulation of sonar

• US Classifications

  • 434 - Education and demonstration