3628453

Information

• Patent Grant
• 3628453

• References
• Source

• Patent Number

  3,628,453

• Date Filed

  Not available

• Date Issued

  Tuesday, December 21, 1971
  53 years ago

• CPC

  • B41J3/365 - Toy typewriters
  • G09B17/00 - Teaching reading

• US Classifications

  • 101 - Printing
  • 434 - Education and demonstration