From the page: "Cummins Turbo Technologies
The Holset Engineering Co. was a British company that produced turbochargers, primarily for diesel and heavy duty applications
In 1973 the company was purchased by Cummins after briefly being owned by the Hanson Trust. Holset now operates facilities in China, India, Brazil, the Netherlands, the United Kingdom, and the United States.
In 2006, the division officially changed its name to Cummins Turbo Technologies to be identified more closely with its parent company. The turbocharger products still use the Holset brand name.
Cummins Power Generation
In 1986, Cummins began acquisition of Onan and completed it in 1992. Since then, Onan has evolved into Cummins Power Generation, a division of Cummins. The Onan name continues to be used for modern versions of their traditional engine-driven generators for RV, marine, commercial mobility, home standby, and portable use.
Cummins Emission Solutions
Exhaust and emissions after-treatment company Nelson Industries was purchased in 1999 due to the increasing importance of exhaust after-treatment systems for meeting future emissions standards. The division officially changed its name to Cummins Emission Solutions to be identified more closely with their parent company.