Some people have good ideas, but Grover Miller had a great one. For over 40 years, until his death in September 2013, Grover was recognized as a gifted inventor and innovator of pumping technologies for the construction industry. His years of experience and innovation led him to the development of the adjustable piston and screener for the self-contained concrete leveling unit. A-1 Concrete proprietary equipment allows us to provide an entire concrete leveling operation on one truck. Our system provides the scale needed for large jobs, as well as the compact size and efficiencies needed for smaller jobs. Big or small – we do it all. Innovative Technology sets A-1 apart as a leader in the concrete leveling industry. Grover Millers unique design represents over thirty-five years of experience in pumping technologies, including eight years he spent developing and perfecting the adjustable piston and screener. Grover obtained patents on certain improvements of the concrete leveling unit, and A-1 has secured exclusive rights to this equipment for the use of its nationwide locations. The A-1 system represents a tremendous cost savings in terms of labor, materials, and time. In addition, the A-1 system maintains the appearance of the customer's concrete surface; a decided advantage over the cumbersome tear out and replace method.