  Since Key Comparison CCT-K2, only few comparisons on realizations of
cryogenic fixed points have been carried out, be they bilateral (three, of
which one still pending) or multilateral (two trilateral). Since a forthcoming
general follow-up is unlikely, any bilateral comparison, not only key
comparisons, is most welcome to provide evidence of the continuing thermometric
capabilities of the laboratories involved in the realization of the ITS-90. Not
too long after the creation in 2018 of the Joint Research Laboratory for Fluid
Metrology Evangelista Torricelli between LNE-CNAM and INRIM, the two
laboratories agreed to perform a bilateral comparison at all the cryogenic
fixed points of the scale between 13 K and 273 K, including the two hydrogen
vapour-pressure temperatures required for the full platinum resistance
thermometer range 3.3.1 of the ITS-90. The results are reported here and show a
substantial agreement, within the combined uncertainties.
