SJ Elsner’s Lawnmower Sales and Service, Inc. We have been providing, fast, and friendly maintenance and retail services for both homeowners and commercial lawn businesses in Harford and Cecil counties, since 1961. Our repair facility services almost every manufacturer. Our showroom is full of both new and used equipment. We have an impressive inventory of parts in stock. Steve and John have over 50 years experience in the industry, so you can be sure you are receiving superior service.