- REE)₄Zr(Ti,Fe³⁺,Fe²⁺)₂Ti₂O₈(Si₂O₇)₂; see List of
mineral symbols Haupteinflugzeichen (abbreviated: HEZ), a
radio beacon used for
aviation blind approach...
- were also used: one 300 m off the end of runway, the HEZ (German:
Haupteinflugzeichen, lit. 'main
approach signal'), and
another 3 km away, the VEZ (German:...