INRIM,
University of Birmingham,
University of Hannover,
Toptica Photonics (Germany),
Kayser (Italy),
HHU,
University of Neuchâtel,
AIRBUS DEFENCE AND SPACE GMBH,
University of Florence,
NPL MANAGEMENT LIMITED,
CSEM,
OHB,
EPFL,
Paris Observatory,
PTB,
OHB,
Menlo Systems (Germany)