Rocketdyne
The Rocketdyne Division was founded by North American Aviation (NAA) in 1955, and was later part of Rockwell International (1967-1996) and Boeing (1996-2005). In 2005, the Rocketdyne Division was sold to United Technologies Corporation, becoming Pratt & Whitney Rocketdyne as part of Pratt & Whitney. In 2013, Pratt & Whitney Rocketdyne was sold to GenCorp, which merged it with Aerojet to form Aerojet Rocketdyne.
Hydrodyne
Hydrodyne was a boat company founded by Abner Crosby in the late 1950s. The company was then later run by his son Abner (Ab) Crosby Jr. until 1993 when he sold his interest in the company to private investors. The Hydrodyne trademark is owned by another ski boat manufacturer and may one day reappear on boats. At the current time the use of the name for marine applications is non-existent.