1780507

Information

• Patent Grant
• 1780507

• References
• Source

• Patent Number

  1,780,507

• Date Filed

  Not available

• Date Issued

  Tuesday, November 4, 1930
  94 years ago

• CPC

  • H04L15/08 - with a single key which transmits dots in one position and dashes in a second position
  • H04L15/04 - Apparatus or circuits at the transmitting end

• US Classifications

  • 178 - Telegraphy