Parker-Hannifin HPD is a leading industrial manufacturer and servicer of highly engineered hydraulic fluid power systems and components. Denison maintains sales and manufacturing operations in more than 15 countries, serving an array of original equipment manufacturers, hydraulics distributors and end-users. Its products are used in a multitude of end-use applications from mobile equipment used in the construction, demolition agricultural, mining and utilities industries to machinery used in industrial manufacturing and marine equipment used in both commercial and military sea vessels. Denison Hydraulics, originally known as The Cook Motor Company, was founded in 1900 in Delaware, Ohio, as a manufacturer of heavy-duty industrial gasoline engines.