The insectoid Xi Charrians worked in cathedral-factories on the planet of Charros IV. The company was known for making Hoar Chall Ring Drive Gel, a podracer lubricant, and was a sponsor of such podraces as the Phoebos Memorial Run.
Shortly before the blockade of Naboo, the Trade Federation contracted the Xi Char to create some of the vehicles and droids used during that skirmish.
During the Clone Wars, the Republic sent an army of clone troopers led by Jedi Knights to destroy the factories on Charros IV, permanently crippling the company. Sienar Fleet Systems absorbed what little remained of Haor Chall Engineering shortly thereafter.
In Emissaries to Malastare, this company is referred to as "Hoar Chall Engineering."