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DS Smith makes sustainable packaging and paper products and operates a European network of 12 paper mills producing around 4 million tonnes of corrugated case materials and specialist industrial products annually. The company also provides recycling services, and its stated purpose is to help customers respond to changing shopping habits with sustainable packaging solutions.
dsm-firmenich is a global creation and innovation partner that manufactures and combines ingredients for nutrition, health, and beauty. Its three businesses span Perfumery & Beauty, Taste, Texture & Health, and Health, Nutrition & Care; the company says its global team numbers nearly 21,000 people and operates across more than 100 countries.
From its Pennsylvania base, DST America manufactures sorption dehumidifiers and engineered humidity-control systems for industrial and commercial use. The company is the American subsidiary of Sweden’s Seibu Giken DST, whose roots reach back to 1985, and its parent group is tied to Seibu Giken’s silica-gel rotor technology, developed in Japan since 1984. DST America also supports its equipment with an in-house engineering and service team reporting more than 35 years of experience.
Founded in 1949 in a repurposed Pennsylvania slaughterhouse, Du-Co Ceramics Company makes technical ceramic components and insulators for demanding electrical, thermal and high-temperature applications. Still owned and operated by the Cooper family, the company combines in-house engineering, tool-and-die work and development labs across two ISO 9001:2015-certified facilities, producing everything from custom parts to ceramic-to-metal assemblies for customers worldwide. Its two facilities employ 250 people and can produce millions of parts per day.
Founded in 1919, DuBois Battery is a century-old Pennsylvania battery company whose history includes family stewardship under William Robert Day and his son Fred Day. After relocating to New Castle in 2012, it continues serving motorists, businesses, and other users who depend on reliable battery power, including automotive batteries and industrial equipment.
DuBois Chemicals is a specialty chemical supplier and manufacturer that combines chemical products with equipment, process knowledge, and local technical service. For more than 100 years, the company has served industrial and other target markets, with manufacturing and warehouse operations across North America. Its work includes packaging and briquetting soda ash and making custom material-handling carts.
DuBois Granite and Quartz LLC is a locally owned countertop fabricator specializing in granite, natural stone, quartz, porcelain, and ultra-compact surfaces. The company digitally templates, fabricates, cuts, polishes, and installs countertops, shower surrounds, remnants, and integrated countertop technologies for homeowners, builders, contractors, and businesses in Central and Western Pennsylvania.
DuBose National Energy Services supplies and manufactures nuclear-certified materials, machined parts, fasteners, pipe and custom welded fabrications for the nuclear power industry. Formed as a separate privately held business in 1990 from the Nuclear Division of DuBose Steel, the company has maintained an ASME Section III accredited quality system since 1977 and operates a 200,000-square-foot Clinton, North Carolina facility alongside specialized machining and coating operations. Its 24/7 in-house response model is built for time-sensitive maintenance, repair and emergency orders, including reverse-engineered components for obsolete equipment.
Duchesnay USA is a specialty pharmaceutical company developing and providing prescription treatments for women’s health from pregnancy through menopause. Founded as a family-owned company in Québec in 1970, Duchesnay shifted its focus in 1992 to medications safe for use during pregnancy and became the first pharmaceutical company dedicated to safeguarding pregnant women and their unborn babies. Established in the United States in 2011, the company now offers therapeutic options across multiple stages of women’s lives.
Founded in 1849 as a hardware supply store in Los Angeles, Ducommun is California’s oldest company and today manufactures engineered electronic and structural solutions for aerospace, defense, space, and industrial customers. Its business includes complex electronic assemblies and large contoured aerostructures, supported by engineering and manufacturing operations.
DUDLIK INDUSTRIES INC. manufactures external fuel tanks for Cobra helicopter kits and provides sheet metal fabrication, laser cutting, gaskets, and powder coating services.
Founded in 1953, Duerr Packaging is an independent, family-operated company now well into its second generation. Based in Western Pennsylvania, it runs separate paperboard and plastics plants and serves customers across the United States as well as several foreign countries. The company is particularly associated with custom candy packaging, including its distinctive heart boxes.
Duff Company is a family-owned wholesaler and manufacturer founded in 1947, specializing in plumbing, heating, pumps, water treatment systems, and multi-family housing supplies. They offer machining and manufacturing services, custom water treatment system design, and distribute products for residential, commercial, and industrial markets.
Since 1981, Dumond has manufactured water-based surface-preparation products, best known for its Peel Away paint-removal system and later Smart Strip line. Its products are used by homeowners and professionals on everything from historic restoration work to the Hollywood Sign, Brooklyn Bridge, and NYC Transit Authority projects. Dumond also makes solutions for graffiti, lead encapsulation, masonry cleaning, and related surface-care work.
Founded in 1984 with two employees in Mifflintown, Pennsylvania, DuMor, Inc. manufactures site furnishings for public and commercial outdoor spaces, including benches and custom pieces. The company has grown from a 4,800-square-foot start-up to a nearly 105,000-square-foot facility while remaining family-run through its second and third generations. DuMor also emphasizes green manufacturing, using recycled steel and plastic alongside wood sourced as much as possible from sustained-yield mills.
Samuel J. Schell founded DumpChump after growing up in his family’s manufacturing business and operating Quali-Te Lawn Care Services since 1992. Drawing on that hands-on experience, the company developed an all-electric lifting system to make material handling safer and less strenuous for landscaping and cleanup crews.
Founded by Brian K. Duncan, Duncan Cabinetry has spent more than 20 years handcrafting custom cabinetry and carrying out precision installations for homeowners across the Mid-Atlantic. Based in southeastern Pennsylvania, the company is particularly known for creating highly individualized finishes—from reclaimed wood made furniture-grade to mirror-like high gloss—and for tackling intricate features such as hidden doors and appliance storage. Duncan works closely with architects, builders, designers, and specialty trades to bring unusual residential projects together.
Founded as a neighborhood butcher shop in Berks County by Tod and Chrissy Auman, Dundore & Heister now ships Pennsylvania provisions from its Wyomissing operation, including craft sausage and its distinctive Hex beef snacks. The shop draws on Pennsylvania Dutch whole-animal butchery and farm-to-table traditions, with sausages crafted by award-winning sausage maker Jeremy Nolen and ingredients kept deliberately simple. Its products are sold online as a taste of Pennsylvania delivered to customers’ doors.
DUNMORE manufactures engineered films, foils, and fabrics, with a focus on coated, laminated, and metallized materials. The company has worked in these fields for more than 50 years and operates manufacturing facilities in the United States and Europe. Its products are developed for commercial, defense, military, and space applications as well as other industrial markets.
Founded by nanoparticle and drug-delivery researchers, Pittsburgh-based Duo Oncology is a clinical-stage biotechnology company developing tumor-activated medicines for cancer treatment. Its lead program, DUO-207, is designed to simplify chemotherapy by concentrating drug activity in tumors while reducing exposure in healthy tissue.