The Mister Handy series of robots, named so because of the robot's large number of hands, was first brought to market in 2037 as a general construction and maintenance unit by General Atomics International, with some assistance from RobCo. Primarily used in the United States and Mexico (where it was the leader in sales after the Mexico City earthquake of 2042), the Mister Handy was a reliable robot. An early bug that caused interference in the operation of the multiple arms was fixed with a hardware update in 2039, with no major problems since then. A key selling feature is the nuclear power unit (a model 238B, licensed from Calpower) and self-maintenance modes. Multiple Mister Handies are capable of keeping themselves in working condition and are also fully programmed to perform nuclear fuel replacements. Secondary programming handles radiation cleansing after refueling.