Medusa part of their religion. Medusa was beheaded by the hero Perseus, who thereafter used her head, which retained its ability to turn onlookers to stone, as a weapon until he gave it to the goddess Athena to place on her shield. In classical antiquity the image of the head of Medusa appeared in the evil-averting device known as the "Gorgoneion". The three Gorgon sisters—Medusa, Stheno, and Euryale—were all children of the ancient marine deities Phorcys (or "Phorkys") and his sister Ceto (or "Keto"), chthonic monsters from an archaic world. Their genealogy is shared with other sisters, the Graeae, as in
MEDUSA to the MEDUSA software to CAD Schroer, MEDUSA's biggest reseller in Germany. CAD Schroer, which started as a drafting bureau in 1986, was an active MEDUSA user and had developed a number of add-ons for the software. Thus MEDUSA was now owned by a company that had grown up with the product. The development partnership with Quintic also transferred to CAD Schroer. Under CAD Schroer, project Pegasus became the STHENO/PRO software, which was first launched in 2002. The Fourth generation of MEDUSA, known as MEDUSA4, was launched in 2004. It included a comprehensive revamp of the functionality, the development of