German standard methods for the examination of water, waste water and sludge - Anions (group D) - Part 27: Determination of sulfide by gas extraction method (D 27)— 28 стр.
Tanks for the transport of dangerous goods. Tank equipment for the transport of liquid chemicals and liquefied gases. Product discharge and air inlet valves— 14 стр.
Safety and control devices for gas burners and gas burning appliances. Automatic shut-off valves for operating pressure of above 500 kPa up to and including 6 300 kPa— 46 стр.