Quality requirements for welding - Fusion welding of metallic materials - Part 4: Elementary quality requirements; German version EN 729-4:1994— 5 стр.
Welding - General tolerances for welded constructions - Dimensions for lengths and angles; shape and position (ISO 13920:1996); German version EN ISO 13920:1996— 7 стр.
Central drinking water supply; Basic principles relating to the requirements on drinking water Planing, construction and operation of the installations— 29 стр.
Tendering and performance stipulations in contracts for construction works (VOB); part C: general technical specifications in contracts for construction works (ATV); well sinking— 10 стр.