Assertion: helmholtz coil | /r/HasProperty | built for testing of composite materials
Facets:
value: to low-frequency magnetic fields
type: TRANSITIVE-OBJECT
value: in 1993
type: TEMPORAL
Source sentences:
text: Helmholtz coils were designed and built for the Army Research Laboratory's electromagnetic composite testing laboratory in 1993, for testing of composite materials to low-frequency magnetic fields.