The X-ray astronomy satellite BeppoSAX (Satellite per Astronomia X, "Beppo" in honor ofGiuseppe Occhialini), is a project of the Italian Space Agency (ASI) with participation of theNetherlands Agency for Aerospace Programs (NIVR). The main scientific characteristic of theBeppoSAX mission is the wide spectral coverage, ranging from 0.1 to over 200 keV.BeppoSAX has been developed with the support of a consortium of institutes in Italy and in The Netherlands and of the Space Science Department of ESA (SSD).
A collaboration with the Max Planck Institute for Extraterrestrial Physics also exists for X-ray mirror testing and the calibration of the concentrator/spectrometer system. Prime contractors for space and ground segments are Alenia Spazio and Telespazio respectively.
Source: wikipedia, NASA