1691569

Information

• Patent Grant
• 1691569

• References
• Source

• Patent Number

  1,691,569

• Date Filed

  Not available

• Date Issued

  Tuesday, November 13, 1928
  97 years ago

• CPC

  • F42B22/24 - Arrangement of mines in fields or barriers
  • G01S1/02 - using radio waves

• US Classifications

  • 342 - Communications: directive radio wave systems and devices
  • 033 - Geometrical instruments