3638228

Information

• Patent Grant
• 3638228

• References
• Source

• Patent Number

  3,638,228

• Date Filed

  Not available

• Date Issued

  Tuesday, January 25, 1972
  52 years ago

• CPC

  • F41G9/025 - Training or teaching apparatus therefor

• US Classifications

  • 346 - Recorders
  • 434 - Education and demonstration