2400257

Information

• Patent Grant
• 2400257

• References
• Source

• Patent Number

  2,400,257

• Date Filed

  Not available

• Date Issued

  Tuesday, May 14, 1946
  78 years ago

• CPC

  • H04Q9/10 - using single different frequencies

• US Classifications

  • 102 - Ammunition and explosives
  • 340 - Communications: electrical