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Founded in 1915, Donaldson Company, Inc. is a global filtration technology company that develops and supplies filtration products and solutions for a broad range of industries and advanced markets. Its offerings include filtration for engines and equipment as well as industrial air, compressed air, gas, and process applications. The company reports 10 innovation centers, 1,300 scientists and engineers, and 150 locations.
Incorporated in 1959, Donart Electronics is a McDonald, Pennsylvania manufacturer with more than six decades of service to industrial customers in the United States and abroad. Under President John R. Salvadori Jr., who joined the company in 1979 after studying electronics, Donart builds specialized measurement equipment for the steel industry and provides related testing services.
Donjon Shipbuilding & Repair is an Erie, Pennsylvania shipyard and part of Donjon Marine, a marine services company with more than six decades of experience. Known for its unusually large Great Lakes dry dock, the 44-acre yard serves domestic and international customers with vessel construction and repair work.
With more than 35 years in textile design, Donna Melvin creates and manufactures knitted blankets, pillows, bed scarves and the registered Wrap® box-spring cover for hospitality, spa and retail clients. Launched in 2016, Donna’s Knit Resource Concepts is a WBENC-certified, 100% woman-owned business whose products are designed and made entirely in the USA. Melvin has built a directory of more than 350 copyrighted patterns and counts Disney Cruise Line, Hilton Hotels and Marriott International among its accounts.
Donohue Railroad Equipment, Inc reconditions and repairs rail cars and railroad components to specifications that exceed original tolerances, and also sells new rail car components. The company has built a reputation on quality, service, and dependability.
Founded beside Pennsylvania’s Susquehanna River in 1906, family-owned Donsco makes machined iron castings and finished industrial parts for customers ranging from regional firms to companies such as CNH and Xylem. Today, 350 employees work across two foundries and in-house machining and tooling operations spanning 165,000 square feet of foundry space. Its long history is paired with modern engineering, including rapid tooling and prototyping, while every product is made with 90% recycled materials.
Since 1971, Dontech has designed and manufactured custom optical components, coatings, filters, and display and touchscreen enhancements for demanding systems. Its Doylestown operation is vertically integrated, supporting projects from concept through final delivery and producing components for applications ranging from military and avionics displays to medical equipment and spacecraft. Dontech’s quality system is certified to both AS9100D and ISO 9001:2015.
Since 1971, Dontech has designed and manufactured custom optical components and coatings that help displays, touchscreens, and precision optical systems perform in demanding environments. Its Doylestown operation is vertically integrated across four facilities, supporting projects from concept through final system delivery and producing everything from optical filters to functional coatings for spacecraft components. Dontech’s quality system is certified to both AS9100D and ISO 9001:2015.
Since its 1969 start producing computer punch cards in Florida, doodad has grown into a Lancaster, Pennsylvania trade-only printer specializing in fast, highly versioned advertising inserts for shared-mail marketers and newspaper publishers. The company opened a second plant in 1986 and now serves towns across two-thirds of the country, with production typically ready in three to five days. Doodad also recycles 4.5 million pounds of waste paper annually and uses regenerative thermal oxidization to destroy more than 99% of printing-process VOCs.
Family-owned and operated since 1974, Dooley Gasket and Seal manufactures custom gaskets in its own 32,000-square-foot facility while also serving as a worldwide distributor. From its U.S. operation, the company uses waterjet, flashcut, punch-press and CAD capabilities to turn customer samples or drawings into application-specific sealing parts. Dooley supports maintenance teams and original equipment manufacturers with design guidance, gasket selection advice and stocked products available for same-day or next-day delivery.
Founded in Pittsburgh in 2005 by Vietnam veteran Briane Hartley, Door Guard Inc. manufactures made-in-America elevator protection systems that shield cabs and building interiors during moves, deliveries, and renovations. Its custom-fit liners use a patented locking system for fast installation while keeping elevators operational, a practical alternative to repairing a damaged cab. The company says its products now protect more than 1,000 buildings nationwide.
With roots reaching back to Multitech’s founding in 1984, Doosan Robotics Americas is a Pennsylvania automation company that grew from industrial distribution into custom robotic integration. Its ONExia division is known for building collaborative-robot systems for manufacturers, with each project developed and tested in-house at its 10,000-square-foot facility. The company serves customers across the United States and Canada.
Dor-Mae Industries is a family business founded in 1967 by Miles F. Reitnouer and his wife, Doris Mae, beginning in the cellar of their row home. The Reading, Pennsylvania company grew from tool-and-die work into metal stamping and fabrication and now operates in a 130,000-square-foot facility. It is owned by the founders’ two daughters, with the next generation involved in continuing the business.
dormakaba manufactures access and security products, with a history in the Americas dating to 1980, when Dorma acquired Reading Door Closers. The company operates sites across the United States, Canada, Mexico, and Brazil, and reports manufacturing centers of excellence in the Americas. Its heritage also includes DORMA, founded in 1908, and Kaba, founded in 1862; dormakaba Group began operations in 2015.
Family-run Dorman Products has been solving automotive repair problems since 1918, developing aftermarket parts for the people and businesses that keep cars and trucks on the road. Its engineers are known for rethinking failure-prone original-equipment designs, often making repairs more accessible to technicians and vehicle owners. Based in Colmar, Pennsylvania, Dorman has grown its catalog to more than 118,000 products while retaining an entrepreneurial culture of contribution.
Since 1989, locally owned Dorneyville Pharmacy has hand-made customized prescriptions as a specialty compounding pharmacy for patients and their companion animals across Pennsylvania’s Lehigh Valley and beyond. Its PCAB-certified operation includes a hazardous-drug laboratory meeting USP 800 specifications, while its trained team works with medical providers and veterinarians to tailor medications to individual needs.
Dorothy’s Candies makes hand-crafted Swiss chocolates in White Oak, Pennsylvania, carrying on recipes and practices developed by founder Dorothy Gastel. The business grew from Dorothy’s small McKeesport home-basement shop into a company that sells more than ten tons of boxed chocolates each year across the United States and beyond.
Founded by Kadidja Dosso after her severe allergic reaction to traditional braiding hair, Philadelphia-based Dosso Beauty makes clinically tested, non-toxic and hypoallergenic synthetic braiding hair for safer protective styling. The Black woman-owned company, established in 2018, also develops hair-care products and operates The Dosso Beauty Experience, a luxury braiding salon and retail store in its hometown. Dosso Beauty says it has served more than 200,000 customers and its hair is free of heavy metals.
Born in Mirandola in 1994 from the ideas of Fulvio Soriani and Marco Reggiani, Doteco has built its identity around three decades of close work with plastics processors. Now part of Piovan Group, it has sold more than 23,000 dosing units worldwide and supports extrusion-line customers through eight service centres and an international partner network.
Double H Plastics, Inc. is a family-owned manufacturer of plastic packaging, extruded components and custom packaging solutions. Founded in 1974 by Harry Harp as a profile extrusion business, it has grown into a multi-facility operation serving packaging and converting applications, with in-house design, tooling and prototyping. Its packaging facilities are SQF certified, and the company also holds FSC and SFI chain-of-custody certifications for its paper and printing operations.