Hamilton Associates has been in business since 1950, with a proven track record of growth achieved through strength in our core businesses, innovation, and acquisition.

Elevator Safety Company (ELSCO) is the world’s premier manufacturer of ride-quality-improving elevator roller guides, swivel sliding guide shoes, and related accessories. Supplying elevator manufacturers as well as elevator installation and service contractors, our guides provide superior performance and value in commercial buildings around the world.

Air Techniques International (ATI) is the global leader in testing equipment for specialized filters and masks. Our experience in specialized filtration testing is unmatched. Since 1961, we’ve enabled our customers to improve product quality, ensure worker health and safety, and comply with the most stringent testing standards and regulations for filtration of airborne particulates. We are the trusted resource for government, military, nuclear, and commercial industries.

Dirt Killer Pressure Washers is both the American distributor of the high quality line of German pressure washers manufactured by Kränzle, and the builder of the Dirt Killer line of pressure washers using the Kränzle pump. We sell these industrial grade pressure washers through distributors throughout the USA. In addition, we operate a retail store, Atlantic Pressure Washers, which serves the Baltimore market.