"Penetration." . . . . "Electromagnetic shielding." . . "ELECTROMAGNETIC SHIELDING." . . . . . "Electromagnetic field penetration studies"@en . . . . . . . . . . . . . . . . . . "Apertures." . . "APERTURES." . "MAGNETIC PERMESBILITY." . . "Langley Research Center." . . "United States. National Aeronautics and Space Administration." . . "Electromagnetic fields." . . "ELECTROMAGNETIC FIELDS." .