2177077

Information

• Patent Grant
• 2177077

• References
• Source

• Patent Number

  2,177,077

• Date Filed

  Not available

• Date Issued

  Tuesday, October 24, 1939
  85 years ago

• CPC

  • H04L17/14 - with optical sensing means

• US Classifications

  • 178 - Telegraphy
  • 235 - Registers
  • 250 - Radiant energy