The 400 Hz units from AXA became such a success that a new company, AXA Power, was created. During the first year, AXA Power manufactured approx 100 pcs of 400 Hz ground power units per year, but that ratio significantly changed over the following years.
In year 2000, AXA Power was acquired by the industrial conglomerate Illinois Tool Works, ITW, with head office in Chicago.
During the next decade, AXA Power continued under this brand name but in 2013, the name changed to ITW GSE to reflect the affiliation to ITW. Today, ITW GSE is considered the world's major manufacturer of 400 Hz units with equipment in major airports all over the world.
In the below article from Janes Airport Review, you can read about AXA Power (highlighted in yellow) and other ITW GSE legacy brands: