DIN 15920-4:2011-11

This standard applies to the production of freely proceedable boat-trucks individually or combined with each other. It also applies to the combination of freely movable boat-trucks with ramps, steps and stairs in accordance with DIN 15920-1 and DIN 15920-2 for stage and studio sets and frameworks in accordance with DIN 4420-1 and DIN 4420-2. This standard does not apply to boat-trucks, whose direction is determined in principle.