2214910

Information

• Patent Grant
• 2214910

• References
• Source

• Patent Number

  2,214,910

• Date Filed

  Not available

• Date Issued

  Tuesday, September 17, 1940
  84 years ago

• CPC

  • H04L25/202 - using mechanical devices
  • H04L25/26 - Circuits with optical sensing means

• US Classifications

  • 178 - Telegraphy
  • 359 - Optical: systems and elements