3675340

Information

• Patent Grant
• 3675340

• References
• Source

• Patent Number

  3,675,340

• Date Filed

  Not available

• Date Issued

  Tuesday, July 11, 1972
  52 years ago

• CPC

  • G09B1/10 - by means of pins and holes

• US Classifications

  • 434 - Education and demonstration
  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets