3726025

Information

• Patent Grant
• 3726025

• References
• Source

• Patent Number

  3,726,025

• Date Filed

  Not available

• Date Issued

  Tuesday, April 10, 1973
  51 years ago

• CPC

  • G09B23/14 - for acoustics

• US Classifications

  • 434 - Education and demonstration
  • 040 - Card, picture, or sign exhibiting