Buoyant aids for swimming instruction - Part 2: Safety requirements and test methods for buoyant aids to be held; German version EN 13138-2:2002— 19 стр.
Buoyant aids for swimming instruction - Part 2: Safety requirements and test methods for buoyant aids to be held; German version EN 13138-2:2007— 23 стр.
Buoyant aids for swimming instruction - Part 2: Safety requirements and test methods for buoyant aids to be held; German version EN 13138-2:2007— 23 стр.