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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.
Known for turning children’s creative time into hands-on, reusable play, DoodleFace makes screen-free wipe-away crayon boards for young learners. Its U.S.-made boards are designed with input from teachers and occupational therapists, helping children practice fine-motor skills, handwriting grip, and coordination without relying on electronics or markers.
Born from a handmade prototype in a Massachusetts makerspace and launched through one of Kickstarter’s most successful campaigns, 3Doodler makes 3D printing pens that let people draw physical objects in midair. Since 2013, the company has built a community of more than five million users, with products ranging from low-temperature pens for children to tools for educators, professionals, and edible candy creations. Its Start+ line emphasizes child safety and compostable filament, while tactile controls developed with the RNIB make the pen more accessible to people with vision impairments.
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.
Columbus, Ohio-based Doolittle Gaming is an independent board game publisher founded by Taylor Doolittle. Its first game, Reincardnated, launched successfully on Kickstarter in 2021 and turns players’ incarnations through 60 unique beings into competing Life Lines shaped by Karma and personal Life Purpose cards. The company says it plans to build a broader catalog of games in the years ahead.
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.
Founded in Berlin in 1990, dopa develops and manufactures diamond tools, processing equipment and precision-optical components for demanding surface-finishing work. Its distinctive strength is the combination of in-house tool production with its own optics manufacturing, allowing the company to develop and test complete processes for industries ranging from semiconductor and medical technology to aerospace. dopa operates from a 12,200-square-metre Berlin site and has been certified to DIN EN ISO 9001:2015 since 2018.
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.
Dorcy offers flashlights, lanterns, spotlights, survival bags, consumer batteries, headlamps, signal wands, rechargeable portable lighting products, and LED glowsticks under the Dorcy, LifeGear, and DieHard brands. The submitted source context also describes product development and retail support.
Founded in 1962 as a family-owned business, Dorel Home makes affordable ready-to-assemble furniture for rooms throughout the home. Its portfolio spans multiple furniture segments and includes the long-running COSCO brand, which has been designing practical household solutions for more than 80 years. Dorel Home distributes through more than 300 retail partners in over 40 countries and is expanding its use of responsibly sourced materials, recycled fibers, and Greenguard Gold-certified products.
Founded by Earl Dorfman in 1957, Baltimore’s Dorfman Museum Figures makes highly realistic figures and conservation forms for museums and institutions. Its customizable figures have brought human presence to exhibits ranging from the Smithsonian to Singapore, while its conservation forms are designed to display historic garments safely. The studio works with clients from small historic houses to large commercial attractions, tailoring figures to the exhibit and budget.
Known for turning ambitious consumer-product ideas into market-ready goods, Doris Dev is a product development agency based in New York and Hong Kong. Its design, engineering, and manufacturing specialists guide clients from concept through finished-product shipment, with work spanning products such as Canopy’s humidifier and Blueland’s reusable cleaning bottle.
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.
Dormotech develops wireless hardware, clinical software, and cloud infrastructure for comprehensive sleep diagnostics in both patients’ homes and attended laboratories. Its DormoVision X™ platform connects 38-channel home and in-lab polysomnography within one review and reporting workspace, with the company reporting 96.6% agreement with traditional attended Type I PSG in clinical validation. Dormotech also offers a research platform for multichannel sleep data and machine-learning analysis.
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.