Check hubtex's 3050 which the combi is somewhat modeled after. Propane and diesel 4 way units since the 80's. Baumann and fantuzzi also have taken a stab at these units. I was referring to the industry profile on this site which said "The company was formed in 1998 by McVicar and fellow engineer Robert Moffett. Combilift developed the world's first multi-directional forklift, designed to fill a gap in the materials handling market. "