CMC MPD (Multi-Purpose Device)FEATURES An Innovation in Rope Rescue! Pat. 7,658,264 The MPD allows you to go from lowering to raising without changing hardware. More than nine years of research and development went into the patented Multi Purpose Device (MPD), which features major innovations in advanced technical hardware for rope rescue professionals. The MPD's high efficiency pulley, with an integral rope grab mechanism, allows it to be used as a lowering device on the main