Robert B Carlson, Fredrick D Wucherpfennig: Shoulder and arm exercise machine. The Toro Company, R Lawrence Buckley, September 20, 1988: US04772015 (65 worldwide citation)

An arm and shoulder exercise machine (20) including a base (22), a vertical rack (32) and resistance means (38) is disclosed herein. Resistance means (38) can be adjusted vertically and pivotally with respect to rack (32) using a unique rack-and-pinion system. A preferred machine (20) also includes ...