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MD
Ray Machine Incorporated makes the original patented Table Crumber, a compact scraper designed to keep dining tables clear of crumbs. Baltimore-based production continues the invention developed by restaurateur John Henry Miller, who patented the pocket-size design in 1941 and improved it in 1950. The company still manufactures the crumber in Miller’s hometown, using aircraft-grade aluminum and offering laser engraving for custom orders.
Since 1987, co-founders Vilma and David Anderson have operated Rayleigh Optical Corporation as a worldwide fabricator of large custom precision optics. The Hanover, Maryland, company specializes in spherical and aspherical components from 0.25 to 1.5 meters, with its mirrors and lenses used at premier astronomical sites including Pan-STARRS and the Dark Energy Survey Instrument. It also extends its shop and expertise to amateur telescope makers through its planned Center for Amateur Optics and Telescope Making.
Founded by entrepreneur Don Breidenbach Sr. in 1982, Raymar Information Technology is a legacy technology company known for keeping industrial communications networks in service. It manufactures and supports equipment for businesses, utilities, and governments, serving customers in more than 30 countries while providing maintenance and technical support through in-house and field professionals.
Established in 1986 by security experts, RBtec Perimeter Security Systems is known for bringing field experience in high-risk installations to the design and manufacture of outdoor intrusion-detection systems. The company has installed more than 5,000 systems in 57 countries, with solutions built for demanding sites such as airports, utilities and correctional facilities.
Since Doug Macuch founded it in 1991, RCI Custom has built its identity around practical, made-to-order work for professional technology installations. The 100% American-owned Frederick, Maryland company is known for custom panels and related connectivity solutions, with its own PanelBuilder SE design software and an ISO 9001:2015-certified small-business operation.
RCS Services LLC is a Maryland-based provider of specialized aircraft support for mission-focused operations. The company helps customers carry out aircraft modification programs and related technical work across several airframe categories.
For more than 35 years, RCT Systems has been a certified small business recognized for developing difficult-to-build technology for national security and commercial applications. Its record includes more than 170 SBIR awards, over 150 patents, and a Tibbetts SBIR Award, with work ranging from power-conversion systems to intelligence support for government customers.
Founded in 1986, Re-form is a Mid-Atlantic office furniture reuse and remanufacturing company that refurbishes, stores, installs and redeploys workplace furnishings. From its 50,000-square-foot Baltimore-area warehouse and production facility, the company manages furniture assets for corporations and government agencies while helping smaller businesses furnish offices with used, new and remanufactured pieces. Its cradle-to-cradle approach keeps quality commercial furniture in service longer through repair, refinishing, reupholstery and responsible reuse.
Re-Steel Supply Company fabricates and supplies reinforcing steel for large-scale construction, including bridges, highways, stadiums, and high-rise buildings. Founded in 1973, it is a family-run, third-generation business and the parent company of fabrication facilities and an epoxy coating plant.
Since its founding in 1979, Reactel, Incorporated has built its identity around specialized RF and microwave engineering for demanding communications and defense applications. The Gaithersburg manufacturer develops custom filters and related assemblies for customers worldwide, with designs reaching millimeter-wave frequencies and an ISO 9001 certification held since 1996.
Reading Crane & Engineering Co. designs, engineers, manufactures, installs, inspects, repairs, and maintains overhead cranes, hoists, automated crane systems, runway systems, control systems, and below-the-hook lifting devices. It serves primary metals, heavy manufacturing, transportation, mining and energy, utilities, maritime, pulp and paper, and power generation markets.
ReAgg supplies aggregate and construction materials, operates a concrete recycling facility, and provides hauling, disposal, delivery, roll-off, crushing, screening, and equipment rental services. It serves construction projects across Maryland, Washington, D.C., Northern Virginia, and the greater Baltimore metro area.
Founded in early 2010, Real New Energy is a clean-energy technology development company operating across California, Oregon and the Netherlands. The company develops and brings to market technologies for distributed power, including the BladeRunner micro-hydro platform and QuinteQ flywheel energy storage, while also advising energy businesses on strategy and operations. Its work is shaped by a belief that locally generated energy and viable storage can help reduce dependence on fossil fuels and centralized utilities.
RealBuilders supplies and builds wood trusses, wall panels, engineered lumber products, lumber packages, and structural building materials for general contractors and construction projects. It also provides framing, flooring, property restoration, and property management services.
For over 40 years, Really Raw Honey has packed totally unprocessed American wildflower honey, keeping its pollen, propolis and honeycomb in every creamy, spreadable jar. Based in Baltimore, the company works with family beekeeping operations whose honey is packed by hand on their farms and homes, straight from the hive, without straining, filtering or heating. Its bee-centered network also supports environmentally sound beekeeping and shares knowledge with new beekeepers.
Rebel Sports Group produces custom sports uniforms, team apparel, spirit wear, fan gear, and player packs for schools, clubs, leagues, teams, and athletic programs. Its capabilities include DTF printing, embroidery, sublimation, apparel decoration, artwork management, production, and fulfillment.
Founded by Dr. Sanford A. “Sandy” Glazer, a former U.S. Navy Dental Corps captain, Red Bag Solutions has spent more than a quarter century developing on-site medical-waste processing technology. The company serves healthcare and life-science facilities with its patented Steam Sterilization and Maceration systems, which render biohazardous waste sterile and unrecognizable at the point of generation.
On a 56-acre Smithsburg hillside that was once the Naylor Peach Orchard, Kevin and Yvonne Ford run Red Heifer Winery, making wine from a vineyard planted in 2010. Owner and winemaker Kevin Ford processes, ages, and bottles every wine on-site, while the family farm’s history—from peaches and apples to dairy and hay—still shapes the winery’s character. Opened in November 2012, the adults-only winery pairs its dry and sweet wines with sweeping views of the surrounding mountains.
Red Shedman Brewery is building a new brewery and taproom in Mt. Airy, Maryland, with an opening planned for mid-2026. Until then, the brewery is pouring beer from a temporary shed at Linganore Winecellars, giving the local operation a stopgap home while construction moves forward.
Nearly 38 years of hands-on experience with GM electronic engine management define Redline Motorsports, a South Florida shop led by president Howard Tanner. The company develops reliable performance builds for late-model GM vehicles, serving enthusiasts who want anything from a street car to a dedicated race machine. Its long involvement with direct-injected GM engines now extends to the mid-engine C8 Corvette.