In 1959, the business was booming, Mac had outgrown his home facilities and moved to a new location where MacKissic Incorporated resides today. In 1960 MacKissic introduced the only removable and interchangeable grinding screens for their leaf shredders, another MacKissic first.
In 1964 a young explosives engineer named George Knotts needed a manufacturing site and an office to run a fledgling company called Amerind, Inc., so the two companies shared the facility until 1967 when they merged and Amerind-MacKissic was formed.
Meanwhile the lawn and garden products business was growing. In 1966 lawn and garden sprayers were introduced fully launching the Mighty Mac® line. In 1971 the Mighty Mac® Dealer-Distributor Organization was established. The next year the Mighty Mac® Chipper was added to the Leaf Shredder forming the patented Mighty Mac® Shredder-Chipper, the first to utilize a centrifugal clutch for easy starting.
In 1982 Amerind-MacKissic became a wholly-owned subsidiary of Inductotherm Industries of Rancocas, NJ, and the business and facilities were expanded. New products continued to be developed and added such as leaf blowers, walk-behind vacuums, and stump cutters. In 1990 the Amerind division was sold, and MacKissic Incorporated became entirely dedicated to the lawn and garden industry.
In 1991 MacKissic acquired Merry Tiller®, a garden tiller system with a legendary reputation for strength and durability. The Merry Tiller® uses Honda power equipment engines but is more durable than the Honda tiller products because the Merry Tiller® had a uniquely similar history to MacKissic as both companies were formed in 1947, and both had a long history of providing quality products.
MacKissic announced their acquisition of the Easy Auger® product line, manufactured by E-Z Industries, Inc. of Alexandria, MN, in November 2001. The Easy Auger® was the first auger of this design type and was originally introduced in 1991; in 1996 the first self-propelled model was developed.