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Founded by Joseph d'Entremont in his garage in 1981, Lenox Laser makes precision-drilled microholes, apertures, slits, and flow-control orifices for demanding applications. The Glen Arm company works across materials ranging from metals and glass to plastics and ceramics, producing features as small as 0.5 microns and calibrated micro-leaks used in pharmaceutical packaging. Its measurement and calibration work follows NIST-traceable practices within an ISO/IEC 17025:2017 quality system, and its components have reached space satellites as well as customers worldwide.
Founded by Horst Lenser in 1969, LENSER Filtration GmbH makes precision-fit filter elements and related filtration solutions for solid-liquid separation. The Senden, Germany, company invented the membrane filter element in 1973 and now operates worldwide as part of the ANDRITZ Group, with 400 employees serving customers in more than 150 countries. Its work combines a broad product base with hands-on process advice and testing to match filtration equipment closely to each application.
Founded in 1987 as a one-room manual machine, tool and die shop with a single Wire EDM, Lenson Machine Inc. now operates a 9,000-square-foot, climate-controlled manufacturing facility in eastern Baltimore County, producing prototype and production parts through CNC machining and precision EDM work. Its 14 CNC machines and supporting manual equipment also allow the company to handle stamping, tool fabrication, and selected mold and die repairs, from one-off parts to production runs in the thousands. Lenson is ISO 9001:2015 certified, with measurement equipment certified and traceable to NIST.
Columbus-based LENTECHS is a privately held, clinical-stage ophthalmic medical device company developing patented soft, suspended contact lenses for people with presbyopia. Its lens design sits behind the upper eyelid and allows the eye to move freely behind a centered lens, aiming to provide glasses-like vision across distances. The company’s core technology was licensed from The Ohio State Innovation Foundation, and its innovations have received 38 global patents in addition to multiple U.S. patents.
Since 1946, Lenz Inc. has designed and manufactured fluid-power connectors and hydraulic products, with its distinctive O-ring Seal Tube Fitting at the center of the business. The Dayton, Ohio company also produces filtration and tank-accessory products, pressure gauges, and adapters for mobile and industrial applications. Lenz combines long and short-run production with CNC machining and stocked inventory intended to support off-the-shelf delivery.
From its Upper Austrian headquarters, Lenzing Aktiengesellschaft turns renewable wood into cellulose-based fibers for textiles, nonwovens and technical applications. The Lenzing site is the only production facility worldwide making all three generations of cellulose fibers—lyocell, modal and viscose—and also serves as the Lenzing Group’s central research and development center. Its biorefinery concept uses every component of the wood, producing pulp, fibers, co-products and bioenergy rather than leaving valuable material to waste.
Founded in 1989 by engineer Aamir Anjum, Lahore-based LEO Corporation Pakistan designs and manufactures power equipment while providing electrical, industrial and agricultural engineering services. Its work ranges from uninterrupted power supplies and voltage stabilizers to renewable-energy projects, automation and metal fabrication, with a notable specialization in poultry and dairy systems that began in 2007. The company also operates sourcing and trading services based in Pakistan and China, supporting industrial customers with equipment and project solutions.
Since 1939, family-owned Leo Ingwer has designed and manufactured fully custom diamond jewelry in New York City’s Diamond District. Now in its third generation, the company keeps every process in-house and unautomated, crafting one-of-a-kind engagement rings, wedding bands, and fine jewelry at its Manhattan headquarters.
Established in 1986, Leo International, Inc. is a Brooklyn-based import manufacturer serving the PVF, HVAC, and plumbing industries. The company is known for producing piping products through forging, casting, and injection molding, including service-weight hub fittings.
Founded by Leo in 1948, Leo J. Roth Corporation provides commercial and residential HVAC, plumbing, and roofing services across the greater Rochester area, along with green-energy solutions. Now in its fourth generation, the Webster-based company is a New York State-certified Women-owned Business Enterprise and also handles custom commercial pipe fabrication through its metal shop.
Founded in 1982 as a traditional printing company, Leo Paper Group has grown into a global printing communications manufacturer producing paper bags, books, packaging and other printed products. With more than 10,000 employees across eight worldwide locations, the group combines large-scale production with its own product-development and innovation teams, including a technology center focused on new materials and printing techniques. Its manufacturing story also includes a stated goal of becoming a zero-waste factory and long-running efforts to reduce material, water and energy use.
Founded in 1918, Leon Miller & Company, Ltd. is a family-run Pittsburgh jewelry manufacturer that grew from Leon Miller’s jewelry repair shop. The business has been run by Leon’s sons Arnold and Fred since the 1970s and makes designs for independent jewelers, including custom one-of-a-kind creations.
Born from New York City’s wartime building boom, Leonard Powers has served the city’s steam systems since 1933. The Manhattan company is known for its deep Con Edison district-steam experience and for maintaining a 24/7 emergency response for building owners across the region. Its newer LPI Energy group extends that long local history into turnkey energy-conservation work for commercial, multifamily, and institutional clients.
Family-owned and operated since Leonard Marks founded it in 1953, Leonard’s Draperies has grown from an Arlington, Virginia, retail store into a commercial window-treatment manufacturer. Today, the company’s work is rooted in centralized manufacturing in the Washington, D.C.–Baltimore corridor and serves regional commercial projects with custom draperies and shades.
Since 1945, family-owned and operated Leonardi Manufacturing has made U.S.-made metal solutions, evolving from handbag frames into custom contract manufacturing and its own tree-care products. Based in Weedsport, New York, the company works with customers from design and prototyping through production, drawing on more than 80 years of metalworking experience and a long history of developing stump-grinding and other tree-care solutions.
Founded in 1969, Leonardo DRS is a defense technology manufacturer headquartered in Arlington, Virginia, supplying advanced systems to U.S. national security customers and allied forces. Its operations include a broad naval electronics manufacturing business and specialized sensing technologies, with more than 600,000 square feet of manufacturing and test space across eight naval electronics locations.
As a Leonardo subsidiary with operations in Tucson and Huntsville, Leonardo Electronics US is known for translating advanced electronics expertise into solutions for demanding defense and commercial programs. Its Tucson facility manufactures high-power semiconductor laser components and systems, while the Huntsville operation provides lifecycle support for U.S. government and Department of Defense programs. The Tucson site holds AS 9100D, ISO 9001:2015, and ISO 14001:2015 certifications.
Leonardo Helicopters develops and manufactures vertical-flight aircraft, including helicopters, tiltrotors and unmanned solutions. Its helicopter range serves civil, parapublic and military missions, and the company states that its platforms operate in more than 150 countries with training, maintenance and mission-support services.
Born in South Philadelphia in the 1970s, Leonetti’s makes handcrafted Italian strombolis and calzones for convenient retail meals. Its dough still follows a family recipe more than 100 years old, and the company was the first to package stromboli for retail sale after originally delivering them to Philadelphia’s Italian restaurants. Today, Leonetti’s foods are sold through retailers across the United States while retaining their South Philly character.
Founded in 1970, Leonhardt Manufacturing Co., Inc. makes complex tubular components, welded assemblies, and precision metal fabrications for OEM production programs. Based in Hanover, Pennsylvania, the ISO 9001:2015-certified contract manufacturer operates from a 95,000-square-foot facility and is particularly known for combining tight-tolerance tube bending with highly cosmetic finishes. Its roughly 90-person team has also been recognized by the Association for Manufacturing Excellence for putting lean manufacturing into daily shop-floor practice.