Knowles Electronics

Knowles Electronics was acquired by Doughty Hanson in June 1999.

Since its foundation in 1946, Knowles has used its core competency in acoustic technology to build expertise in hearing aid transducers and low voltage integrated circuit design, electronic controls and sensors, and precision manufacturing. Under Doughty Hanson's ownership it had facilities in seven countries spread over North America, Europe and Asia, with its largest operations located in the United States, China and Malaysia.

It was sold in September 2005 to the Dover Corporation for US$750 million.