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Since starting in a rented barn in 1976, Thomas W. Springer, Inc. has grown into a 25-person Landenberg shop making complex, small precision-machined components for customers across the United States and abroad. Its 20,000-square-foot facility combines Swiss-type and conventional CNC turning with milling, while in-house engineering support and a temperature-controlled inspection department help it handle demanding parts from prototypes through production runs. The company is an ISO 9001:2015 registered firm and uses statistical process control throughout production.
Family-run since 1899, Thomaston Mills manufactures hospitality and institutional linens in the United States, including bedding and terry towels. Its 400,000-square-foot manufacturing operation combines substantial fabric inventory with automated and manual sewing lines, allowing the company to produce custom sizes, private-label goods and RFID-ready items in smaller runs. Thomaston Mills says it annually makes more than 450,000 dozen sheets and 1 million dozen pillowcases, with products fabricated and finished in the USA from domestic and imported greige fabric.
Founded in 1993, Thompson Fabrication manufactures waste containers at its 65,000-square-foot facility in Wheatland, Pennsylvania. The company says all manufacturing is done at its six-acre site, where its team builds roll-off and hooklift containers and developed its rolled-bottom design to address rust in container bottoms.
Founded in 1971 as Lindsay Machine Co., Thompson Gear and Machine is a general machine shop with a dedicated gear-manufacturing facility. The Delmont company has grown from a 500-square-foot garage to more than 6,000 square feet with over 40 machine tools, producing gearing such as splines and bevel gears.
Family-owned and operated for more than 70 years, Thompson Trophy Mfg Inc. creates custom trophies, engraved awards, and other recognition pieces for the greater Los Angeles area. Based in Gardena, the company is known for one-of-a-kind designs that mark special events and turn achievements into lasting keepsakes.
Thoren Caging Systems, Inc. makes ventilated animal-housing systems for research facilities, including its Maxi-Miser® individual-ventilation system for mouse and rat cages. The Hazleton, Pennsylvania company traces its roots to Thoren Industries, which pioneered warm-surface plastic cages in 1953, and developed its Maxi-Miser® pressurized individual ventilation system with The Jackson Laboratory in 1978. Its modular systems can be configured as fixed or mobile installations and are made in the USA.
Dave Cloud, a lifelong woodworker and former Boeing manufacturing technology leader, founded Thornbury Wood Design Build in 2015 after more than four decades in furniture design and construction. Working from the New Hope area of Bucks County, Cloud creates individualized furnishings shaped by careful material selection and a blend of traditional craft with aerospace-informed technical experience. He also passes that knowledge on through small woodworking classes and apprenticeships.
Opened in 1976 as a welding and fabrication shop, Albion’s Thornton Industries now machines metal components and tooling for forging-industry customers serving automotive, rail, and energy markets. The company completes work in-house at its 30,000-square-foot facility, handling parts from small components up to 45,000 pounds and repairing forging equipment when needed. Its design and engineering team also turns sketches and existing parts into prototypes or replacement components through reverse engineering.
With more than 28 years in the field, Thortex Group is a Collegeville, Pennsylvania company known for helping organizations preserve aging infrastructure. It supplies and applies protective coatings and rehabilitation systems for industrial and municipal clients, including custom composite repairs for pipelines and tanks.
Inspired by Pittsburgh’s Johnny “Appleseed” Chapman legend, Threadbare Cider + Mead has been making small-batch craft ciders and meads with local apples and honey since 2017. Its flagship Farmhouse cider, made with apples from Soergel Orchards using old-world production methods, won Best in Show and a Gold Medal at the 2025 Pennsylvania Farm Show Cider Competition. The Northside cidery also operates a cider house for private events and a bottle shop at Ross Park Mall.
Family-owned Three D Metals has grown from Dave Dickens Sr.’s 1972 startup into a metals company serving more than 5,000 customers across the U.S., Canada, and Mexico. The Valley City, Ohio, business is known for its people-centered approach and for supporting demanding industrial production through metal processing and distribution. Its ISO 9001-certified operations span 325,000 square feet of production facilities.
Three Little Pigs makes French-style charcuterie and gourmet foods, including its signature pâtés, in small batches. Founded in 1975 by two French chefs in Greenwich Village, New York, the company grew from a specialty deli into a producer whose products are sold at retailers nationwide. Its stated heritage centers on traditional French recipes and handcrafted production.
Three M Tool traces its roots to 1946, when it supplied stamping dies to local manufacturers, and has spent more than 75 years building metal-fabrication expertise. Today, the York company is best known for custom wire baskets that solve precise manufacturing problems, particularly in cleaning and parts-processing work. Its team has produced more than 18,000 designs and typically returns quotes with drawings in less than a week.
Three Points Automation is a system integrator and OEM providing both mechanical and electrical services. They are creative plant floor problem solvers capable of providing simple mechanical design or reverse engineering up to full automated machinery, including electrical controls design, panel fabrication, and logic programming.
Three Rivers Optical is a family-owned wholesale optical laboratory founded in 1969 by Bill and Madeline Seibert, and now overseen by their son Steve. Starting with grinding wholesale uncut glass lenses, it grew into a fully integrated, single-location optical lab producing and finishing lenses, with digital CNC and freeform capabilities developed from the early 2000s onward. It serves independent eye-care practices and optometrists with lens products and related optical goods.
Founded by Pittsburgh engineers Sean Handerhan and Sinjon Bartel, Three Rivers Precision is a small CNC machining company built around hands-on manufacturing experience and practical problem-solving. With more than a decade in the industry, the founders work with customers on prototype machining and production needs, serving fields such as aerospace and robotics. The company holds AS9100D and ISO 9001 certification.
Founded in 2017 by former Lancer Systems engineers, THRiL manufactures firearm magazines, stocks and accessories for professional, competitive and recreational users. The company develops, tests and makes all of its products in the USA, with a focus on dependable performance in demanding conditions. Its SKUNK3DWORKS line also serves as a direct-to-consumer research and development pipeline, using customer feedback to refine 3D-printed components.
Built around physician Riyaz Bashir’s BASHIR™ platform, Thrombolex makes endovascular catheters that combine mechanical clot fragmentation with targeted thrombolytic delivery for arterial and venous thromboembolic conditions. The New Britain, Pennsylvania medical-device manufacturer markets multiple FDA-cleared devices, including catheters with expandable infusion baskets designed to restore blood flow in peripheral and pulmonary vessels. Its leadership and clinical programs draw on more than 100 years of combined experience and partnerships across the medical field.
Founded in 2010 by a longtime aortic-valve researcher, Thubrikar Aortic Valve develops transcatheter aortic valve systems for treating aortic stenosis. Its investigational Optimum TAVI System is based on more than 30 years of research into the geometry and mechanics of the natural valve, with durability as a central design goal. The privately held, clinical-stage company has partnered with Brazil’s Labcor Laboratórios and is conducting studies in Europe.
thyssenkrupp Materials NA, Inc. distributes metals and plastics and processes materials for manufacturers across North America. The company says it has more than 90 years of experience in material handling and value-added services, and its operations include a network of processing, warehousing, and supply-chain capabilities serving customers in the United States, Canada, and Mexico.