2808660

Information

• Patent Grant
• 2808660

• References
• Source

• Patent Number

  2,808,660

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1957
  66 years ago

• CPC

  • G09B19/26 - Dot-and dash telegraphic codes

• US Classifications

  • 434 - Education and demonstration