3670435

Information

• Patent Grant
• 3670435

• References
• Source

• Patent Number

  3,670,435

• Date Filed

  Not available

• Date Issued

  Tuesday, June 20, 1972
  52 years ago

• CPC

  • G09B29/002 - using magnetic elements

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • D19 - Office supplies