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PA
Since its founding in 1974, Doucette Industries has built its identity around heat-transfer engineering in York, Pennsylvania. The company is recognized as the innovator of the vented double-wall heat exchanger and reports more than 1,000,000 units installed worldwide. Its team brings over 300 years of combined heat-exchanger manufacturing experience to custom work for refrigeration, air-conditioning, and hydronic applications.
From its Milwaukee base, Douglas Dynamics manufactures and upfits work-truck attachments and equipment, including snow and ice-control gear and custom commercial-vehicle solutions. Its brand family traces back to 1946, while the company today operates seven manufacturing locations and 15 installation and distribution centers with more than 1,600 team members. Continuous improvement through its Douglas Dynamics Management System is central to how the company develops and builds equipment sold across North America, Europe, and Asia.
Doutt Tool Inc is an ISO 9001:2008 registered manufacturer of tungsten carbide punches, dies, and precision tooling. The company specializes in custom die set builds, remanufacturing, and contract machining services including wire EDM, jig grinding, and high-speed milling for automotive, aerospace, and other manufacturing industries.
Founded in 1988, Dove Plastics is a Hamburg, Pennsylvania manufacturer known for custom blow molding and more than 85 years of collective experience in the field. Its team works closely with customer engineers and designers to turn new product concepts into finished plastic parts, with project coordination continuing through production.
Dow is a materials and chemicals manufacturer supplying polymer, silicone, and other material technologies for industrial and consumer applications. Its offerings include silicone elastomers for fabrication and optical silicone materials for lighting and electronics, alongside resin manufacturing products and solutions.
Locally owned and operated since 1989, Down East Granite fabricates and installs custom stone surfaces for homes and commercial spaces across Central Pennsylvania. Its two-showroom operation pairs a large indoor granite gallery with a technology-equipped production facility and a team of craftsmen, while in-home consultations extend its design and measurement service to customers in surrounding communities. Harrisburg Magazine named Down East “Simply the Best” from 2014 through 2024.
Founded in March 1996 by cyclist and Temple University graduate student Dr. Yan Lyansky, Downtube designs and sells folding bicycles directly to riders. The Greensboro, North Carolina company is known for pairing compact, travel-ready frames with unusually comfortable suspension, including its early commercially available suspension-and-belt-drive folders. Its direct design, import, distribution and retail model keeps the bikes focused on practical value rather than dealer markups.
Doyle & Roth Manufacturing Company designs and fabricates tubular heat-transfer equipment, including shell-and-tube heat exchangers and pressure vessels. Established in 1932, the women-owned company reports producing approximately 300–400 exchangers and pressure vessels annually for customers across varied industries. Its fabrication facility in Simpson, Pennsylvania, has operated since the 1960s.
Doyle Design is a custom cabinet and millwork company serving the greater Philadelphia area and New Jersey. They design and manufacture custom cabinetry, doors, furniture, and architectural woodwork for residential and commercial clients. They offer design assistance and work with designers, architects, homeowners, and contractors.
Built on a Pennsylvania family beer business that began in 1948, Doylestown Brewing Company makes craft beer through its brewery operations in Doylestown. Owner Joe Modestine carries forward three generations of beer and restaurant experience, while head brewer Erik Walp has helped the company grow from a small brewpub brewery into a regional operation. The company also provides contract brewing services and maintains a presence in downtown Doylestown.
Family-owned Doylestown Glass has served customers since 1952, building its reputation around custom work and practical guidance. The company provides architectural flat-glass fabrication and installation for homeowners, businesses, architects and contractors, with service for existing glass products as well.
With a rotorcraft legacy of more than 75 years, DPI UAV Systems designs, builds, and tests tethered unmanned aerial systems for defense and commercial missions. Since 1992, the company has developed persistent airborne communications and surveillance platforms, including systems designed for U.S. Navy and U.S. Army operations. More than 20 SBIR contracts and testing in operationally relevant environments have shaped its mission-focused engineering and payload-integration work.
Founded in 1988, DPI, Inc. is a Hatboro manufacturer known for solving difficult machining problems for OEMs whose equipment must perform in demanding conditions. Its particular strength is cryogenic work, including components for medical imaging and aerospace systems that require reliable helium containment in extreme cold. DPI is ISO 9001:2015 registered and ITAR registered, supporting projects from prototype through production.
Dr. Brownies makes vegan brownies and the first refrigerated ready-to-bake brownie mix, with gluten-free options available. Based in Philadelphia, the business grows out of its founder’s 30-year career as a restaurateur, culinary instructor and food-truck owner, and also creates bite-size “Browniecuterie” boards for gatherings.
Based in Bonn, Dr. Schutz Group makes floor-care and floor-renovation systems that help preserve the value of flooring worldwide. Its three core brands—Dr. Schutz, eukula and scratchnomore—cover professional and household care, including a long-established focus on parquet and cork through eukula and furniture glides that protect floors from scratches. The group develops and tests its systems at a Technikum opened in 2013 and produces in Hessisch-Oldendorf, supporting partners and customers through training and technical advice.
Since 1984, locally owned and operated Dr. Trans has helped San Diego drivers get back on the road through transmission and clutch repair. The company’s shop culture is built around “Do It Right The First Time,” pairing transmission overhauls with a strong emphasis on value, professionalism, and community. Dr. Trans serves customers from its Kearny Mesa location.
For 63 years, DraCool-USA has built its name around the specialized care of plate heat exchangers. Formerly known as DraCool of Lykens, the company was purchased by Javier “Tony” Avendano in 2002 and now operates support facilities in four states, with a manufacturing location in Ohio. Its technicians help industrial customers keep equipment running through refurbishment and related field service.
Since 1942, Drafto has manufactured heavy-duty lifting and weighing equipment for steel mills, foundries, and other demanding industrial operations. The Cochranton, Pennsylvania company is known for engineered coil lifters and patented ROTAHOOKS™ that bring controlled movement and positioning to heavy loads, while its service team repairs and refurbishes Drafto and other brands. Drafto traces its roots to a 1934 metal-stampings business and continues to develop custom, American-made material-handling equipment.
Founded in Lübeck in 1889, family-run Drägerwerk AG & Co. KGaA makes medical and safety technology designed to protect, support and save lives. Now spanning five generations, the company employs around 16,700 people and serves customers in more than 190 countries, with hospital and industrial safety work linked by its “Technology for Life” philosophy. Its equipment is tested for durability and reliability throughout development, production, delivery and service.
Founded in spring 2016 by Lew Amicone, a former U.S. Navy machinist who served aboard the USS Pennsylvania, Dragonfire Tool Storage is a small, growing company based in Western Pennsylvania. It makes durable, affordable workstations for professional shops and everyday users, refining its designs through feedback from customers who rely on them.