Abstract: On February 5, 1986, Employee #1, a production laborer for the Donn Corporation, was assisting the product manager during product development. He was mixing concrete slurry for forming 24-in.-square concrete floor panels. The one cubic yard Can-Do concrete systems mixer was five ft wide with a 5-ft by 10.5 in. opening 34 in. above the base of the mixer was used. The mixer was factory-equipped with a steel door and a limit switch to prevent operation while the opening was unguarded. Employee #1 was injured when he placed his hand into the path of the 2-ft by-11 ft rotating paddles while attempting to wash his hand with a hose. The management reported that the door was open and the limit switch was disabled at the time of the accident.