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StairMaster was founded by Lanny Potts, Jim Walker, and George Schupp and launched by Tri-Tech, Inc. of Tulsa, Oklahoma in 1983 at the National Sporting Goods Association trade show. The first piece of equipment, StairMaster 5000, was a rotating staircase machine. In March 1984 the StairMaster 5000 was replaced with the StairMaster 6000.
Photo: Shutterstock. Design: Eat This, Not That!Jumping onto the StairMaster can feel like a never-ending climb, but it's one of the most effective machines for burning calories and shedding pounds.
The International DuraStar line, known as the 4000 series prior to 2008, is a line of medium-duty trucks produced by Navistar International from 2001 until 2018. [1] Introduced as the successor to the International 4000 series of 1989–2001, the 4000 series was renamed the DuraStar in 2008.