Manufacturer Directory
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Founded in 1928 as the Dunkirk Radiator Corporation in Dunkirk, New York, Dunkirk manufactures boilers for residential and light commercial heating. The company continues to build gas and oil boilers at its Dunkirk facility and now operates as a brand of ECR International under Granby Industries. Its history includes an early focus on cast-iron boilers and radiators, while today its heating line also includes ENERGY STAR-certified models.
Dunkirk Metal Products has been part of the Dunkirk, New York manufacturing community since 1947, when it began building a reputation for dependable customer service and quality operations. Acquired by three local businessmen in 2012, the company now works from a 40,000-square-foot facility and serves manufacturers across the Great Lakes region. DMP has held ISO 9001:2015 certification since 2002.
For more than 50 years, DUNMORE has built its name as a specialist manufacturer for customers tackling unusual or demanding material challenges. Its aerospace work, developed over more than three decades and qualified to more than 100 specifications, supports aircraft and spacecraft programs, while its ISO 9001:2015-certified facilities in the United States and Europe take projects from development into production.
Dunn’s Valve Testers traces its Houston-area manufacturing legacy to 1978, when founder Emmitt Dunn produced the company’s first valve-testing machine for the U.S. Navy. Today, the company builds made-in-USA testing equipment to customer specifications and supports machines throughout their working lives, including systems that have remained in service for more than 30 years.
Built by gamers for gamers, Dunwyvern Gaming makes the SideQuest, a left-hand gaming keypad designed around a true curve rather than a flat keyboard contour. The startup developed its prototypes with feedback from gaming testers in the United States and United Kingdom, pairing an ergonomic shape with programmable keys and an analog thumbstick. Its Command Console software supports Windows and Mac computers, while SideQuest profiles can be stored for use across different games.
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.
Established in 2010, DUO Signage + Graphics is a Baltimore-based team known for carrying projects through from initial idea to finished installation. The studio works with design firms, developers, and institutions across the United States, creating signage and environmental graphics that bring clarity and character to physical spaces.
Based in Long Island, New York, DuoProSS Meditech Corp. is a medical technology company known for its focus on reducing needlestick injuries among healthcare professionals. It provides North American marketing, sales, service, and support for the BakSnap safety syringe while continuing research and development in medical safety products.
Founded in 1985 by former Westinghouse project manager Raymond “Pete” Dupill, Dupill Group is a service-disabled veteran-owned company now led by Marines Chad and Cornell Dupill. For more than 35 years, it has built its reputation solving demanding valve problems for nuclear facilities, government agencies, and industrial customers, with work governed by ASME NQA-1 and ISO 9001:2015-compliant quality systems.
Dupli is a Matt family-owned company founded in 1965, with its modern history beginning when Kemper Matt Sr. bought the four-person operation in 1980. Now based in a 150,000-square-foot former 1904 building in Syracuse, the company is best known for envelope manufacturing and has expanded into a broader production partner for organizations and trade customers. Its on-demand model is designed to reduce overproduction while supporting recurring print programs.
Locally owned and operated on Long Island, Duplication Depot handles CD and DVD duplication and replication, along with converting older recordings and images into usable digital formats. In business for over 30 years, the company serves projects ranging from a couple of copies to several hundred and can carry the work through packaging, graphic design, and print production. Its newer production affiliation also connects customers with video, live sound, staging, and event support.
Dupon USA designs and manufactures ice cream filling machinery, hardening equipment, baked products, and packaging for producers ranging from small batches to industrial lines. The Columbus-based operation is part of the family-owned D’Hoore Group, whose ice cream-cone roots reach back to Italy in the early 19th century, and now operates three U.S. production plants spanning more than 600,000 square feet. Its equipment scales from 1,800 to more than 45,000 products per hour, while its North American bakeries produce more than 2.5 billion cones and sandwiches annually across the broader network.
DuPont develops technology-based materials and solutions for demanding applications, with particular strength in water purification, healthcare, and advanced industrial markets. Its global research network includes flagship innovation centers in Wilmington, Delaware, and Shanghai, where scientists and engineers work with customers and research partners on practical challenges. Sustainability is built into DuPont’s innovation priorities and operations, including goals set for 2035.
DuPont™ Spectrum™ (Spectrum Plastics Group) is a medical device contract development and manufacturing organization that designs and produces components and finished devices, including medical tubing and catheters, for healthcare manufacturers. With 61 years of experience, 18 global locations, 1 million square feet of operations and more than 2,900 employees, the company supports programs from prototype through high-volume production. Its manufacturing network is certified to ISO 9001:2015 and ISO 13485:2016, with AS9100 certification and ITAR compliance supporting demanding medical and aerospace-related work.
Duquesne Mine Supply Co is a worldwide supplier of trolley line electrical suspension replacement parts for mining operations and overhead cranes.
Founded in 1955, Dura Architectural Signage is a Long Island City manufacturer whose roots are in precision engraving for companies serving the federal government and armed forces. The company has since built a global record, shipping more than two million signs to over 100 countries, while producing architectural signage for demanding commercial and institutional projects.
Incorporated in 1961 as an Alnico magnet manufacturer, Dura Magnetics now designs and manufactures engineered-to-order magnets and magnetic assemblies from its U.S. facility. The Sylvania company combines 2D and 3D magnetic simulation, in-house production, and testing to take projects from concept through prototypes and production. Its AS9100D certification and ITAR registration support work in aerospace, defense, and other tightly regulated applications.
Founded in 1983 in Holland, Ohio, DURA TEMP Corporation designs and manufactures hot-ware handling materials, engineered components, and related industrial solutions for glassmakers. Its in-house engineers develop proprietary high-temperature composites and custom parts, while the DT INDUSTRIALS brand applies that expertise to other manufacturing sectors. DURA TEMP products are used by OEMs and manufacturers in more than 50 countries, backed by machining, research and development, and hands-on installation support.
For more than 85 years, Dura-Fibre has been a Menasha, Wisconsin manufacturer known for turning layered paper into rigid, purpose-built solutions for demanding industrial customers. Its 125,000-square-foot facility supports custom work for companies seeking a lighter alternative to wood with more durability than corrugated packaging, while also serving specialized applications such as book-cover panels.
For more than 50 years, Dura-Metal has manufactured precision tooling and wear- and corrosion-resistant components from ultra-hard materials at its 48,000-square-foot facility in Irwin, Pennsylvania. Its application engineers can design original tooling or reverse-engineer existing parts, while a quality program that checks materials and workpieces throughout production supports customers in demanding industries. Since June 2023, Dura-Metal has operated within Hyperion Materials & Technologies’ Precision Solutions brand.