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Founded in 1994 by two Ohio State electrical engineering graduates, Westerville-based OneVision Corporation manufactures can-seam inspection and weighing systems for food, beverage, and specialty manufacturers. Its U.S.-made equipment grew from precision optical instrumentation developed with Ross Laboratories and now includes the SeamMate® system, which helps production teams measure and monitor double-seam quality. OneVision has installed and actively supports more than 350 systems worldwide, with technical assistance continuing throughout the life of its equipment.
Ontario Mechanical, LLC is an industrial contractor specializing in fabrication, installation, and maintenance work for industrial and manufacturing facilities. Based in Mansfield, Ohio, it has more than 25 years of experience and provides engineered fabrication and process piping work alongside industrial maintenance services.
OnTop is a yard-game brand built around its signature OnTop Ball Toss game, formerly known by that name, and a community of players of all ages. It shares rules and strategy guidance while working toward an updated, more affordable version of the game.
OP Specialty Bracing designs and provides orthotic and prosthetic solutions made exclusively for children, pairing pediatric-focused devices with care from certified clinical specialists. As part of OrthoPediatrics, the company builds on more than 20 years of pediatric orthopedic expertise and operates specialized clinics across the United States and internationally. Its clubfoot work has a particularly deep history: OPSB collaborated with Dr. Ignacio Ponseti on the Mitchell Ponseti Clubfoot Brace and remains the only company identified as fabricating the true brace.
Since 2003, Carey, Ohio-based OPS Controls has engineered and manufactured electrical control systems for mobile equipment, taking OEM projects from concept through production and support. Its work spans custom wire harnesses and CAN-based controls, with a distinctive emphasis on wireless remote systems and an onsite S.C.O.P.E. Starter Kit that lets OEMs configure their own radio and keypad controls. The company also digitally tests its U.S.-made harnesses and uses the QT9 quality-management system to track production issues and customer requests.
Formed in 2019 through the merger of Opta Minerals and SKW Metallurgie, Opta Group LP develops custom-engineered additives, specialized equipment and technical solutions for modern manufacturing. Its Carbide Industries business produces calcium carbide, whose reaction with water generates acetylene and calcium hydroxide for industrial use. With more than 900 employees and operations across four continents, the group combines global reach with on-site technical expertise.
Opta Group LP is a global industrial manufacturer formed in 2019 by the merger of Opta Minerals Inc. and SKW Metallurgie GmbH. It develops and produces custom-engineered materials and equipment for metallurgical, construction, and specialty chemical applications, with more than 1,000 employees and 35 locations across 11 countries. Its portfolio includes metallurgical treatment products, calcium carbide-based chemicals, and recycled glass materials.
Toledo-based Optical Mirror has spent more than 15 years manufacturing precision glass optics, cutting custom first-surface mirrors, beamsplitters, and anti-reflective glass for engineering and scientific work. Its specialty is pairing optical-quality coatings and careful inspection with an unusually quick ordering process, with many custom pieces cut and shipped the same day or within a day. The company also shares practical guidance through its Optical Mirror Academy and supports customers with engineers who understand the applications behind the glass.
Known for combining regional support with global supply, Optimas OE Solutions manufactures and distributes fasteners for OEMs and other industrial manufacturers. The company serves more than 3,500 customers and produces over 400 million fasteners annually at its Wood Dale, Illinois facility, with certified quality systems supporting automotive and industrial requirements.
Founded in Dayton, Optimus Prosthetics provides custom prosthetic solutions for amputees, with care that follows patients from surgery through rehabilitation and beyond. Its Dayton clinic houses the company’s fabrication lab, allowing prosthetists and technicians to adjust sockets and produce 3D-printed check sockets close to the fitting room rather than relying on an outside lab. With clinics in Dayton, Columbus, and Cincinnati, Optimus also builds community through its annual Limbitless Drive amputee golf clinic and tournament.
Opus Packaging manufactures custom corrugated and industrial packaging products, including shipping containers, custom partitions, graphic packaging, interior dunnage, packs and kits, and returnable systems. It also provides packaging consultation and design, testing, production, warehousing, distribution, delivery logistics, inventory management, and fulfillment services.
Opus Packaging is a family-run company shaped by cousins Kevin Manor and Butch Stoner, whose corrugated-box roots reach back to the mid-1940s. Formed as a single holding company in 2013, it now operates five manufacturing facilities while maintaining a family-type culture centered on honesty, respect and dignity. The company is known for working with customers to develop packaging suited to their particular needs.
Built on a corrugated-box tradition that reaches back to the mid-1940s, Opus Packaging manufactures customized packaging and manages its delivery from five facilities in Michigan, Indiana, Ohio and South Carolina. Cousins Kevin Manor and Butch Stoner joined forces in 2001, formed Opus as a holding company in 2013, and brought the locations under the Opus name in 2019. The company stands out for handling design, in-house production, testing and distribution as one coordinated packaging operation, including an in-house ISTA-certified testing laboratory.
OPW Clean Energy Solutions brings together established brands that engineer and manufacture fluid-handling equipment and cryogenic systems for hydrogen, LNG, helium and industrial gases. Its portfolio spans ACME Cryogenics’ mission-critical systems, RegO’s pressure-control equipment and CPC-Cryolab’s cryogenic components, giving the business a distinctive reach from individual valves to installed infrastructure. The group’s roots include ACME Cryogenics, established in Allentown in 1969, and RegO Products, whose history traces to the invention of the CO₂ cylinder valve and its 1918 founding.
Since 1892, OPW has built its identity around dependable fluid-handling solutions for customers worldwide. Now part of Dover, the company employs more than 1,500 people and operates manufacturing sites across four continents, including a Hamilton, Ohio-based operation where OPW Engineered Systems has made components in the USA since 1983. OPW maintains ISO-9000 certification across its global manufacturing footprint.
Founded in 1980 by Ciaran O'Melia, Cleveland-based OR-TEC manufactures wastewater treatment equipment for municipal, food-processing and industrial facilities. Its systems are designed around individual site conditions, with a particular signature in superfine Blue Whale screens with openings down to 1 millimeter and automated, unattended sludge-dewatering equipment. OR-TEC serves customers across North America and internationally, with U.S.-made stainless-steel equipment and support from its Cleveland team.
Ora K Beauty Products makes natural, botanical hair and skin care built around a family hair-growth recipe that traces back to Freddie Mae Davis in the 1800s. Ora Kay Eatmon refined the inherited ointment into a lighter formula for all hair types, blending organic herbs, oils, and vitamins in products designed for everyone from children to people undergoing chemotherapy. The Mansfield, Ohio company says its non-toxic products are never tested on animals and typically show results within 30 to 90 days.
Orange Chair is a Cincinnati studio known for turning architectural ideas into distinctive seating for commercial spaces. Its work is shaped through close collaboration with designers and end users, with recent projects including custom banquettes for restaurants and other venues.
Born from a 1932 discovery that orange peel could dissolve dental impression cement, ORANGE-SOL develops citrus-based industrial cleaning technology and specialty removers. Its formulations serve demanding work from cable and equipment cleaning to medical adhesive and tar removal, with the company emphasizing safer ingredients alongside strong cleaning performance. ORANGE-SOL products now reach users across five continents and have been used in major oil-spill cleanups as well as hospitals and burn centers.
Orbia Polymer Solutions (Vestolit) manufactures general and specialty PVC resins and chemical derivatives, with production sites across the Americas and Europe. The business has more than 75 years of experience in vinyl resin production and marketing, and supplies customers in more than 80 countries. Its products serve applications spanning building and infrastructure, automotive, household goods, and medical supplies.