2409720

Information

• Patent Grant
• 2409720

• References
• Source

• Patent Number

  2,409,720

• Date Filed

  Not available

• Date Issued

  Tuesday, October 22, 1946
  77 years ago

• CPC

  • H04Q9/10 - using single different frequencies

• US Classifications

  • 340 - Communications: electrical
  • 102 - Ammunition and explosives
  • 246 - Railway switches and signals