1815986

Information

• Patent Grant
• 1815986

• References
• Source

• Patent Number

  1,815,986

• Date Filed

  Not available

• Date Issued

  Tuesday, July 28, 1931
  93 years ago

• CPC

  • H04L21/02 - at the transmitting end

• US Classifications

  • 178 - Telegraphy
  • 235 - Registers
  • 382 - Image analysis