2509170

Information

• Patent Grant
• 2509170

• References
• Source

• Patent Number

  2,509,170

• Date Filed

  Not available

• Date Issued

  Tuesday, May 23, 1950
  74 years ago

• CPC

  • G09B19/26 - Dot-and dash telegraphic codes

• US Classifications

  • 434 - Education and demonstration
  • 116 - Signals and indicators