2173164

Information

• Patent Grant
• 2173164

• References
• Source

• Patent Number

  2,173,164

• Date Filed

  Not available

• Date Issued

  Tuesday, September 19, 1939
  85 years ago

• CPC

  • H04L15/20 - with optical sensing means

• US Classifications

  • 250 - Radiant energy
  • 178 - Telegraphy
  • 332 - Modulators