3845572

Information

• Patent Grant
• 3845572

• References
• Source

• Patent Number

  3,845,572

• Date Filed

  Not available

• Date Issued

  Tuesday, November 5, 1974
  50 years ago

• CPC

  • G09B9/22 - including aircraft sound simulation

• US Classifications

  • 434 - Education and demonstration
  • 340 - Communications: electrical