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PA
Founded in Mannheim in 1932, family-owned GEHR manufactures thermoplastic plastic semi-finished products and has grown from a small celluloid goods factory into an international producer. More than 250 employees produce and distribute extruded semi-finished materials, with Mannheim as the headquarters and production operations in the United States and other international branches. The company is particularly focused on thermoplastic rods, sheets, tubes, and profiles, including materials for medical technology.
Founded in 1983 by Jack Geiger and Henry Peck, Geiger Pump & Equipment Company distributes, engineers, manufactures and services industrial and municipal pump and process equipment from its Mid-Atlantic base. The company is known for pairing application engineering and local inventory with in-house machining, fabrication, testing and factory-trained repair, while its packaged fluid systems ship worldwide. Geiger also supports water and wastewater treatment facilities with an experienced environmental process engineering team and customized treatment solutions.
Geissele Automatics manufactures firearms and firearm components, with a particular focus on AR-style rifles and the precision triggers for which its name is known. Its product line also includes complete upper receiver groups, rifle parts and specialized systems such as the MRGG chambered in 6.5 Creedmoor. Based in North Wales, Pennsylvania, the company says it manufactures its AR-style rifles and components in-house.
Family-owned and operated since 1965, Geitz Machine Inc. is a Telford, Pennsylvania precision machining company making custom metal and plastic parts through CNC and prototype services. Founded by master craftsman Matthias Geitz, the business carries his old-world craftsmanship into a modern shop led by his son, Mark Geitz. The family name remains behind every part it produces.
Founded in 1991 by Dr. Barry Arkles, Gelest develops and manufactures specialty chemical materials that help advanced technologies take shape. From its Pennsylvania operations, the Mitsubishi Chemical Group company scales custom chemistry from laboratory samples to commercial production, with particular depth in silicone and organosilane research and in materials for microelectronics, medical devices, and life-science applications. Gelest’s quality management system is certified to ISO 9001.
Founded by Otto Gellner in 1980, Gellner Industrial manufactures water-based acrylic resins and polymers for paints, coatings, and inks. The Hometown, Pennsylvania company carries on a family tradition of chemical manufacturing, with Otto’s son Robert joining in 1987 and helping develop formulas and expand the business. Its chemists and technical staff continue that research while also providing chemical toll manufacturing for customers needing resin production at larger volumes.
Gemel Precision Tool Company, Inc. is an Ivyland, Pennsylvania manufacturer of tooling for pharmaceutical blister packaging machines, a specialty it says it has pursued since beginning tooling production in 1985. With more than 30 years of experience and over 24,000 square feet of manufacturing, engineering, and office space, it also develops custom machinery and package designs for production needs.
Founded in 1972 by Mark Rosenberg, Gemini Bakery Solutions is a family-owned bakery equipment designer and manufacturer continuing a family history in the industry that dates to 1911. Based in Pennsylvania, it supplies custom and integrated equipment systems to commercial and industrial bakeries and describes itself as North America’s largest supplier of specialty bakery systems. The company also provides project lifecycle services and operates manufacturing facilities across Pennsylvania.
Family-owned since 1969, Gemini Plastics makes custom injection-molded plastic parts for customers worldwide. Its Fallsington, Pennsylvania operation occupies 40,000 square feet and runs around the clock, with an in-house tool room supporting mold maintenance and new tooling. The company also operates a 30,000-square-foot facility in Chihuahua, Mexico, and is an ISO 9001:2015-compliant manufacturer.
GEMS Manufacturing Systems is a U.S. manufacturer of safety and protective wear, including gloves, liners, and related protective accessories. The company has manufactured products for more than 20 years, serves government requirements through Indogem Inc., and carries cage code 024R0.
Gene & Boots Candies is a family candy maker founded in 1930 by Gene Madigan and his friend nicknamed Boots, beginning as a Charleroi shop selling popcorn and salted peanuts before developing its chocolate-making business. Now in the third generation of the Madigan family, the company continues to use many of its early formulas and sells candies including its popular assortments.
Gene Davis Sales & Service is an Erie steel supplier and custom fabrication shop, serving the area since Dave Davis and his father opened the business at its current location in 1985. The Davis family has roots in Erie’s steel business spanning three generations, with the company adding custom fabrication around 1990 and later expanding its shop and machining services.
Established in November 2019, Doylestown-based GeneLancet Biosciences develops in vivo gene and cell therapies built around its proprietary single-molecule guide RNA, or LgRNA. The company is advancing LgRNA-conjugate-guided STAR and DuoSTAR genome editors for precise treatments aimed at serious diseases including neurodegenerative disorders, cancer and chronic hepatitis B. Its platform emphasizes scalable, high-purity guide RNA and editing approaches designed to avoid double-strand DNA breaks and support repeat or multiplex treatment strategies.
Tracing its roots to an ice, coal and oil house in South Philadelphia in the 1920s, General Aire Systems is a Mid-Atlantic manufacturers’ representative, distributor and service company for specialty air-handling equipment and air-filtration systems. From its base in the region, the company supports HVAC, cleanroom and indoor-air-quality projects with technical sales staff, filter service and cleanroom certification. Its territory spans New Jersey, Delaware, eastern Pennsylvania, eastern Maryland and parts of New York.
With more than 40 years of specialized experience, General Anesthetic Services is known as an independent expert in anesthetic vaporizer care for healthcare facilities worldwide. Based in McMurray, Pennsylvania, the ISO 13485:2016-certified company supports patient safety by keeping this critical medical equipment accurate, compliant, and in service longer.
Founded in Greensburg in 1968, General Carbide Corporation makes finished tungsten-carbide and steel tooling, wear parts, and precision components through a vertically integrated operation that takes materials from powder to polish. The family-owned, woman-owned company remains under the leadership of founder Premo Pappafava’s daughter, Mona Pappafava-Ray, and employs more than 250 people across four facilities. Its ISO 9001:2015-certified production includes a 50,000-square-foot finishing plant and serves customers in more than two dozen industries worldwide.
General Doors Corporation has manufactured sectional overhead doors since 1947, beginning with wood doors and later adding commercial and residential steel doors. Based in Bristol, Pennsylvania, the company operates its main manufacturing plant there and says it manufactures most of the products it sells, including a full line of wood doors and its own track and hardware. It sells wholesale to professional garage-door distributors and building-supply companies, serving the East and Northeast through its distribution network.
Established in 1899, General Dynamics Electric Boat designs and builds submarines for the U.S. Navy and provides their lifecycle support. It is the prime contractor and lead design yard for Virginia-class attack submarines, and also performs submarine maintenance and modernization at facilities across the United States.
For more than 65 years, General Dynamics has served the aerospace and defense communities as a global company with 117,000 employees. Its businesses develop and support aircraft, military systems and ships for the U.S. government and allied countries, with a model that gives each unit responsibility for understanding customer needs and delivering its work.
General Dynamics Land Systems designs, engineers, builds, and sustains combat vehicles and integrated technologies for military forces. Its portfolio includes tracked and wheeled combat vehicles, robotic platforms, and vehicle software, with operations described in the United Kingdom at Merthyr Tydfil and Oakdale. The company is a subsidiary of General Dynamics.