2658940

Information

• Patent Grant
• 2658940

• References
• Source

• Patent Number

  2,658,940

• Date Filed

  Not available

• Date Issued

  Tuesday, November 10, 1953
  71 years ago

• CPC

  • H04L15/20 - with optical sensing means

• US Classifications

  • 178 - Telegraphy
  • 250 - Radiant energy