Laboratoire Natl Metrologie Essais, CNRS, Observatoire Paris, PSL, Fluke Calibrat, MI, NPL, Guildline Instruments, Keysight Technologies, LEM, Muquans, Natl Precise Grav Measurement Facil, TEGAM, List Cea tech, Ist Nazl Ric Metrologica, METAS, TRANSMILLE, FIRST-TF, IUPAP, Societe Francaise Physique, SIRTEQ, Gravitat References Astron Metrol, Bur Int Poids Mesures, IEEE Instrumentat & Measurement Soc, NCSL Int, Phys Measurement Lab, Canada NRC CNRC