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General Motors is a Detroit-based automotive manufacturer founded in 1908, producing vehicles across Chevrolet, Buick, GMC, and Cadillac. It operates a large U.S. manufacturing network that builds vehicles and automotive parts, and has expanded into electric vehicles and battery technology.
Established in 1950 as one of the country’s first commercial fluoropolymer-coating applicators, General Plastics Corporation is a custom job shop that applies high-performance coatings and manufactures specialty cable sleeving. Its 50,000-square-foot plant handles parts up to 8 by 8 by 25 feet and weighing as much as 25 tons, alongside automated equipment for higher-volume work. The company also custom manufactures nylon solutions and dispersions for thread and fabric applications.
General Plug & Manufacturing makes pipe plugs, reducer bushings, and other standard or custom parts, combining machining, cold forming, and foundry production at its Oberlin, Ohio operation. It supplies manufacturers and distributors in the automotive, pipe, valve and fitting, electrical, and fastener industries, and adds value through sealant application and plating. The company also provides in-house assembly and warehousing for customer products.
Established in Cleveland in 1992, General Sleep Corporation is a medical-device developer known for applying EEG to the study of sleep and sleep disorders. Its Zmachine technology supports clinical and research work, including at-home monitoring, for licensed healthcare and research professionals rather than patients directly. The company holds patents related to insomnia treatment, brainwave analysis, and signal processing.
General Technologies, Inc. fabricates metal parts and builds complete assemblies at its facilities in North Central Ohio. The company has more than 100,000 square feet of manufacturing space and reports over 40 years of experience in the manufacturing industry. It also packages finished assemblies for shipment under customers’ labels.
Founded in Reading, Ohio, in 1947, General Tool Company is a third-generation, family-owned manufacturer of precision hardware and systems for demanding aerospace and defense programs. Its work ranges from aircraft-engine and space hardware to large naval power-generation systems, supported by more than 400,000 square feet across four nearby facilities. Now an Aeron Defense company, GTC retains a distinctive Cincinnati manufacturing legacy while expanding its capacity for complex, mission-critical work.
Generational Fittings, LLC supplies industrial fittings, with a particular focus on air-brake components for trucking, OEM production, and repair applications. Founded after purchasing the assets of O’Brien Brass in April 2020, Genfit draws on O’Brien’s three generations of brass-fittings knowledge—heritage that inspired its name. The company also offers kits and assemblies intended to help customers find the configuration they need.
From its Holland, Ohio operation, Generic Fluid Systems builds automated industrial dispensing equipment for accurately blending and batching multiple liquid ingredients. Its Gravimetrix, Volumetrix and Batchmetrix systems are tailored to production needs, ranging from small proportioned batches to formulations involving more than 60 ingredients. The company also integrates material-supply equipment and provides parts and maintenance agreements for its formulation dispensers.
Genesis Custom Machining produces complex parts through precision CNC milling, with custom design and prototyping available for specialized requirements. The company focuses on advanced manufacturing for customers who need machined components developed to their specifications.
Formed in Ohio in 1991, GeneSyst GPV technologies, Inc. develops and licenses Gravity Pressure Vessel technology that converts organic and hazardous wastes into energy and other usable products. The privately held company is the exclusive licensing source for its patented GPV system and coordinates design, implementation and technical support for licensees in ten states and 34 countries. Its technology is designed as a closed, water-based process rather than combustion, with applications including municipal waste conversion to ethanol.
Since Dan Duncan founded Geneva Hydraulics in 1991, the Utah company has grown through long-standing customer relationships and a plainspoken promise to do what it says. Now led in part by Duncan’s son Jesse, Geneva Hydraulics serves the Intermountain West with hydraulic repair and custom fluid-power work, including projects developed in-house for demanding industrial applications.
Genius One, Inc. is a Highland Heights, Ohio company behind Genius Pipe, a modern cannabis lifestyle brand whose products are designed by smokers for smokers. Its signature approach combines portable design with patented cooling technology, aimed at people seeking a smoother, cleaner smoking experience.
With 97 years behind it, Gent Machine Company produces high-volume precision screw-machine and CNC parts from bar stock ranging from 1/64 to 2 inches in diameter. Its Cleveland-area operation pairs traditional Davenport and Acme production with a 10-machine Swiss CNC department, allowing it to handle both quantities of 500 and runs into the millions, including demanding medical and dental components. A dedicated quality department verifies dimensions throughout production, and the company is IATF 16949:2016 certified.
Gentherm grew from its automotive roots into a global manufacturer known for pioneering heated and cooled vehicle seats. Today, it applies decades of thermal-management expertise to solutions for mobility and medical customers, with more than 14,000 employees across 13 countries. Its Cincinnati medical operation holds ISO 13485:2016 and MDSAP certifications.
Founded by Paul Gentzler in 1953, Gentzler Tool & Die makes precision tooling, dies, and stamped metal parts for manufacturers from its Uniontown, Ohio operation. The company can run simple to complex progressive dies up to 72 inches long and operates a 20,000-square-foot facility alongside a 14,000-square-foot warehouse. Gentzler is ISO 9001:2015 certified and serves production needs ranging from short runs to long-run manufacturing.
Founded by Gerald T. Mearini in 1994, Genvac Aerospace is a Highland Heights, Ohio, company known for solving demanding optical-coating challenges for defense and aerospace customers. Its work includes custom infrared coatings for optical domes, supported by proprietary deposition methods developed over decades. Genvac is ISO 9001:2015 certified and ITAR registered.
From Mason, Ohio, GeoCentral supplies wholesale gift, garden and seasonal décor to retailers, with more than 900 ready-to-sell SKUs shipping from the USA. Its assortment ranges from crystal gifts and jewelry to garden ornaments, wind chimes and planters, giving independent shops low-minimum access to both everyday merchandise and seasonal collections.
Since 1989, GeoCorp has manufactured thermocouples and thermocouple wire in Huron, Ohio, supplying temperature-measurement products directly from its own operation. The company grew into wire production with the purchase of its first braider in 1999 and now operates more than 95 braiders. Its in-house quality-control laboratory is accredited to ISO/IEC 17025 by NVLAP, lab code 200496-0, and GeoCorp offers custom thermocouple configurations for demanding industrial applications.
Geon Performance Solutions develops and manufactures custom-compounded polymers, with a particular depth in PVC, polypropylene and other engineered materials for demanding applications. Established as GEON Performance Solutions in 2019, the company builds on nearly a century of vinyl and polymer expertise and now serves customers through a global network of ISO-certified facilities. Its Foster medical division adds specialized expertise in medical-grade and implantable polymers, including production supported by ISO 13485-certified facilities.
Geon Performance Solutions develops and manufactures custom-compounded polymer materials, with particular strength in PVC compounds and formulated polyolefins for demanding industrial and medical applications. Established as GEON Performance Solutions in 2019, the company builds on nearly a century of polymer history and operates a global network of approximately 1,200 associates and 15 ISO-certified facilities. Its Foster medical division adds specialized expertise in implantable and biomedical polymers, including materials developed for medical devices.