Cast iron was discovered in China during the Warring States period (475-221 BC). It only became essential in the European economy during the 19th century. Today, cast iron represents a significant part of the works created at the GHM foundry in Sommevoire. The metallurgical company benefits from constant activity. It is a subsidiary of the Agora Technologies group, which is currently developing a series of street furniture and cast iron support masts intended for equipping trams and rail lines.