2755461

Information

• Patent Grant
• 2755461

• References
• Source

• Patent Number

  2,755,461

• Date Filed

  Not available

• Date Issued

  Tuesday, July 17, 1956
  68 years ago

• CPC

  • G09B21/006 - using audible presentation of the information
  • G01S11/023 - using impedance elements varying with distance

• US Classifications

  • 342 - Communications: directive radio wave systems and devices
  • 340 - Communications: electrical
  • 343 - Communications: radio wave antennas
  • 434 - Education and demonstration