1) Grip 2) Shifter 1) Shifter 2) Stage technician 3) Stagehand 
• (n.) One who moves the scenes in a theater; a sceneman.
Scene'shift`er noun One who moves the scenes in a theater; a sceneman. 
Sceneshifter was a British long-range railway gun built during the Great War and modified - being fitted with a naval gun - and issued to the Royal Marine Siege Regiment in 1939 at Dover. Sceneshifter was used to bombard German gun positions in the Calais area during the Second World War. Sceneshifter fired a 13.5 inch calibre 1250 lb shell to a ra...
[n] - a stagehand responsible for moving scenery
shifter noun a stagehand responsible for moving scenery