For companies which do stage equipment in general, including lifts, shells, stage machinery, curtain systems, etc., please see the broader category Business: Arts and Entertainment: Tools and Equipment: Theatre.
For companies which specialize primarily in curtain systems, please see Business: Arts and Entertainment: Tools and Equipment: Soft Goods.
For companies that are known mainly for flying performers, please submit to the Business: Arts and Entertainment: Tools and Equipment: Rigging: Flying Effects subcategory.