On- & understage machinery

As the name suggests, on- and understage machinery are all technological machinery that are placed on or under the stage. This includes stage lifts, auditorium lifts, proscenium lifts, turntable wagons, and orchestra pit lifts but also stage revolves, truck lifts and actor lifts. You could even combine some of these machines into one, such as having stage lifts within a stage revolve or using an orchestra pit lift with seating wagons to double as an auditorium lift.