Seakeeper Inc. makes marine motion-control equipment, including gyroscopic stabilizers for boats and the Seakeeper Ride vessel attitude control system. Formed in 2008, it launched its first gyroscopic stabilizer that year and now operates a manufacturing, engineering, and research and development facility in Leesport, Pennsylvania. Its products address boat stabilization both at rest and underway.
Aqua Marine Supply / Hefty Hoist, IncFounded in the late 1980s by Chester Hauck, Aqua Marine Supply/Hefty Hoist manufactures gear drives and electric hoists for boat lifts, including the original Flat Plate and the patented PWC Hoist. The Millersport, Ohio company developed the first totally enclosed boat-lift gearbox, its E-Gear, in 2002 and continues to support products introduced throughout its history. Its E-Gear has been produced for more than 20 years, with over 100,000 units installed on lifts nationwide.MILLERSPORT, OH
Zodiac Milpro InternationalTracing its roots to the Zodiac company founded in 1896, Zodiac Milpro International makes inflatable and semi-rigid boats for military and professional crews. Its five shipyards in Spain, Germany, Australia, the United States and Canada build craft that are customized for missions ranging from special operations and patrol to search and rescue. The company combines hand-assembled construction with a portfolio of patented marine technologies and supports operators through training, engineering and a worldwide service network.STEVENSVILLE, MD
Greenfield Products, IncSince 1959, Greenfield Products has made boating equipment in Greenfield, Ohio, with its roots in the world’s first soft-coated anchors and chain. The small, family-owned American manufacturer is now in its fourth generation and is also credited with introducing bungee marine lines, including Stretch ’n Slide. Its USA-made anchors are coated in its own Greenfield operation, alongside related docking and outdoor products.GREENFIELD, OH
Miller's Island Propeller, IncA family-owned marine manufacturer and service shop in Sparrows Point, Maryland, Miller's Island Propeller makes and reconditions boat propellers while supplying the underwater hardware and shafting that keep vessels moving. Founded in 1971 as a foundry and propeller reconditioner, the company now operates a 55,000-square-foot manufacturing and warehouse facility with rail service. It is also the largest distributor of sailboat propellers in the United States and produces its own Chesapeake 3 sailing propellers.SPARROWS POINT, MD