Devices to prevent pollution by backflow of potable water - Air gap with non-circular overflow (unrestricted) - Family A, type B; German version EN 13077:2003— 16 стр.
Protection against pollution of potable water installations and general requirements of devices to prevent pollution by backflow - Technical rule of the DVGW; German version EN 1717:2000— 48 стр.
Acoustics - Determination of sound power levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995); German version EN ISO 3746:1995— 26 стр.