Stage and studio set up; safety regulations for practicals, ramps, steps, stairs and stage balustrades
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1978

Entertainment technology – Practical types – Part 11: Safety regulations for wooden practicals, ramps, steps, stairs and stage balustrades
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2011